2/28/2012

Snooker

Snooker is a cue sport that is played on a green baize-covered table with pockets in each of the four corners and in the middle of each of the long side cushions. The (baize) cloth on a snooker table has a directional nap running from the balk end of the table towards the end with the (black ball) spot. This affects how a ball rolls depending on which direction it is hit or shot. A regular (full-size) table is 12 × 6 ft (3.7 × 1.8 m). It is played using a cue and 22 snooker balls: one white cue ball, 15 red balls worth one point each, and six balls of different colours: yellow (2 points), green (3), brown (4), blue (5), pink (6) and black (7). A player (or team) wins a frame (individual game) of snooker by scoring more points than the opponent(s), using the cue ball to pot the red and coloured balls. A player wins a match when a certain number of frames have been won.

Snooker, generally regarded as having been invented in India by British Army officers, is popular in many of the English-speaking and Commonwealth countries,^] with top professional players attaining multi-million pound career earnings from the game. The sport is now increasingly popular in China.

History

The game of snooker grew in the latter half of the 19th century and the early 20th century, and by 1927 the first World Snooker Championship had been organised by Joe Davis who, as a professional English billiards and snooker player, moved the game from a pastime activity into a more professional sphere. Joe Davis won every world championship until 1946 when he retired. The game went into a decline through the 1950s and 1960s with little interest generated outside of those who played. In 1959, Davis introduced a variation of the game, known as snooker plus, to try to improve the game's popularity by adding two extra colours. However, it never caught on.

A major advance occurred in 1969, when David Attenborough commissioned the snooker tournament Pot Black to demonstrate the potential of colour television, with the green table and multi-coloured balls being ideal for showing off the advantages of colour broadcasting. The TV series became a ratings success and was for a time the second most popular show on BBC Two. Interest in the game increased and the 1978 World Championship was the first to be fully televised. The game quickly became a mainstream sport in the UK, Ireland and much of the Commonwealth and has enjoyed much success in the last 30 years, with most of the ranking tournaments being televised. In 1985 a total of 18.5 million viewers watched the concluding frame of the world championship final between Dennis Taylor and Steve Davis. In recent years the loss of tobacco sponsorship has led to a decrease in the number of professional tournaments, although some new sponsors have been sourced; and the popularity of the game in the Far East and China, with emerging talents such as Liang Wenbo and more established players such as Ding Junhui and Marco Fu, bodes well for the future of the sport in that part of the world.

The game

Points may also be scored in a game when a player's opponent fouls. A foul can occur for numerous reasons, such as hitting a colour first when the player was attempting to hit a red, potting the cue ball, or failing to escape from "a snooker" (a situation where the previous player finished their turn leaving the cue ball in a position where the object ball cannot be hit directly). Points gained from a foul vary from a minimum of 4 to a maximum of 7 if the black ball is involved.

One game, from the balls in their starting position until the last ball is potted, is called a frame. A match generally consists of a predefined number of frames and the player who wins the most frames wins the match overall. Most professional matches require a player to win five frames, and are called 'Best of Nine' as that is the maximum possible number of frames. Tournament finals are usually best of 17 or best of 19, while the World Championship uses longer matches – ranging from best of 19 in the qualifiers and the first round proper, up to 35 frames in length (first to 18), and is played over two days.

Professional and competitive amateur matches are officiated by a referee who is the sole judge of fair play. The referee also respots the colours on to the table and calls out how many points the player has scored during a break. Professional players usually play the game in a sporting manner, declaring fouls the referee has missed, acknowledging good shots from their opponent, or holding up a hand to apologise for fortunate shots.

Other terminology used in snooker includes a player's break, which refers to the total number of consecutive points a player has amassed (excluding fouls) when at one visit to the table. A player attaining a break of 15, for example, could have reached it by potting a red then a black, then a red then a pink, before failing to pot the next red. The traditional maximum break in snooker is to pot all reds with blacks then all colours, which would yield 147 points; this is often known as a "147" or a "maximum".

Accessories used for snooker include chalk for the tip of the cue, rests of various sorts (needed often, due to the length of a full-size table), a triangle to rack the reds, and a scoreboard. One drawback of snooker on a full-size table is the size of the room (22 by 16 feet (6.7 × 4.9 m)), which is the minimum required for comfortable cueing room on all sides.^[20] This limits the number of locations in which the game can easily be played. While pool tables are common to many pubs, snooker tends to be played either in private surroundings or in public snooker halls. The game can also be played on smaller tables using fewer red balls. The variants in table size are: 10' × 5', 9' × 4.5', 8' × 4', 6' × 3' (the smallest for realistic play) and 4' × 2'. Smaller tables can come in a variety of styles, such as fold away or dining-table convertible.

Governance and tournaments

The World Professional Billiards and Snooker Association (WPBSA, also known as World Snooker), founded in 1968 as the Professional Billiard Players' Association, is the governing body for the professional game. Its subsidiary, World Snooker, based in Bristol, England, organises the professional tour. Over the years the board of the WPBSA has changed many times, which some argue is an indication of in-fighting within the sport. The amateur game is governed by the International Billiards and Snooker Federation (IBSF).

Professional snooker players can play on the World Snooker main tour ranking circuit. Ranking points, earned by players through their performances over the previous two seasons, determine the current world ranking. A player's ranking determines what level of qualification they require for ranking tournaments. The elite of professional snooker is generally regarded as the "Top 16" ranking players, who are not required to pre-qualify for any of the tournaments. The tour contains 96 players – the top 64 from the previous two seasons, the 8 highest ranked professional players on the Players Tour Championship Order of Merit who are not in the top 64, 12 players from the Q School, and various regional, junior and amateur champions.

The most important event in professional snooker is the World Championship, held annually since 1927 (except during the World War II and between 1958 and 1963). The tournament has been held at the Crucible Theatre in Sheffield, England since 1977, and was sponsored by Embassy from 1976 to 2005.Since 2005, tobacco companies have not been allowed to sponsor sporting events in the United Kingdom, and the World Championship had to find a new sponsor. It was announced in January 2006 that the 2006–2010 world championships would be sponsored by online casino 888.com. The Championship is currently sponsored by BetFred.com after 888.com pulled out of their five year sponsorship deal after three years. On 15 April 2009 the World Snooker Championship website announced that Betfred.com would be the new sponsor of the World Championship for the next four years.

The status of winning the World Championship is great, and it is the most highly valued prize in professional snooker, both in terms of financial reward (£250,000 for the winner) as well as ranking points and prestige. The World Championship is televised extensively in the UK by the BBCand gains significant coverage in Europe on Eurosport and in the Far East.

The group of tournaments that come next in importance are the other ranking tournaments. Players in these tournaments score world ranking points. A high ranking ensures qualification for next year's tournaments, invitations to invitational tournaments and an advantageous draw in tournaments. The most prestigious of these after the World Championship is the UK Championship. Third in line are the invitational tournaments, to which most of the highest ranked players are invited. The most important tournament in this category is The Masters,^[38] which to most players is the second or third most sought-after prize.^[39]

In an attempt to answer criticisms that televised matches can be slow or get bogged down in lengthy safety exchanges and that long matches causes problems for advertisers,^[40] an alternative series of timed tournaments has been organised by Matchroom Sport Chairman Barry Hearn. The shot-timed Premier League Snooker was established, with seven players invited to compete at regular United Kingdom venues, televised on Sky Sports. Players have twenty-five seconds to take each shot, with five time-outs per player per match. While some success has been achieved with this format it generally does not receive the same amount of press attention or status as the regular ranking tournaments.

There are also other tournaments that have less importance, earn no world ranking points and are not televised. These can change on a year-to-year basis depending on calendars and sponsors.

Equipment

This section requires expansion with:
a sentence or two about the balls & table; link to the main articles on these topics..

Chalk and cue.

Chalk

The tip of the cue is 'chalked' to ensure good contact between the cue and the cue-ball.

Cue

A stick, made of wood or fibreglass, the tip of which is used to strike the cue-ball.

Extension

A shorter baton that fits over, or screws into, the back end of the cue, effectively lengthening it. Is used for shots where the cue-ball is a long distance from the player.

Rest

A stick with an X-shaped head that is used to support the cue when the cue ball is out of reach at normal extension.

Rest head adaptor

An attachment that slips onto a conventional rest head to make a spider or just to give a slightly different bridge.

Hook rest

Identical to the normal rest, yet with a hooked metal end. It is used to set the rest around another ball. The hook rest is the most recent invention in snooker.

Spider

Similar to the rest but with an arch-shaped head; it is used to elevate and support the tip of the cue above the height of the cue-ball.

Swan (or swan-neck spider)

This equipment, consisting of a rest with a single extended neck and a fork-like prong at the end, is used to give extra cueing distance over a group of balls.

Triangle/Rack

The piece of equipment is used for gathering the red balls into the formation required for the break to start a frame.

Extended rest

Similar to the regular rest, but with a mechanism at the butt end which makes it possible to extend the rest by up to three feet.

Extended spider

A hybrid of the swan and the spider. Its purpose is to bridge over large packs of reds. Is less common these days in professional snooker but can be used in situations where the position of one or more balls prevents the spider being placed where the striker desires.

Half butt

Usually housed underneath the side of the table, the half butt is a combination of a table length rest and cue which is rarely used unless the cue ball needs to be struck in such a way that the entire length of the table is the actual obstacle.

Ball marker

A multi-purpose instrument with a 'D' shaped notch, which a referee can (1) place next to a ball, in order to mark the position of it. They can then remove the ball to clean it; (2) use to judge if a ball is preventing a colour from being placed on its spot; (3) use to judge if the cue ball can hit the extreme edge of a "ball on" when awarding a free ball (by placing it alongside the potentially intervening ball).

The Cloth

The cloth is usually a green baize with a directional nap. The nap will affect the direction of the cue ball depending on which direction the cue ball is shot and also on whether left or right side (spin) is placed on the ball. Even if the cue ball is hit in exactly the same way, the nap will cause a different effect depending on whether the ball is hit down table (towards the black ball spot) or up table towards the balk line. The cloth on a snooker table should never be vacuumed as this can destroy the nap, especially if the vacuum head has beater brushes. The best method is to brush the cloth in a straight line from the balk end to the far end. Multiple brush strokes are fine as long as they are are straight in direction (i.e. not across the table). Some table men will also then drag a dampened cloth wrapped around a short piece of board (like a two by four) to collect any remaining fine dust and help lay the nap down.

Notable players

See also: List of snooker players by number of ranking titles and List of snooker players with over 100 century breaks

In the professional era that began with Joe Davis in the 1930s and continues up until the present day, a relatively small number of players have succeeded at the top level.Reaching and maintaining a place amongst the snooker elite is a tough task, with the standards of the game being such that it requires many years of dedication and effort as well as natural ability.

Certain players have tended to dominate the sport through the decades. John Pulman is generally regarded as the principal player through the 1960s, Ray Reardon through the 1970s, Steve Davis through the 1980s and Stephen Hendry through the 1990s, winning 6 (1970, 1973–76 and 1978), 6 (1981, 1983, 1984 and 1987–89) and 7 (1990, 1992–96 and 1999) World Championships respectively. No one dominated in the 2000s, however Ronnie O'Sullivan winning the title on three occasions (2001, 2004 and 2008) and Mark Williams and John Higgins winning twice (2000, 2003 and 2007, 2009 respectively). Higgins has four world titles in total, having won his first title in 1998 and his fourth in 2011. Last successful title defence was in 1996 when Hendry won the sixth of his seven titles (and 5th in a row).

Running

admin 13:20 Benefits of running No comments

Running

"Runner" redirects here. For other uses, see Runner (disambiguation).
This article is about the type of locomotion in humans. For running in horses, see Horse gait. For locomotion in dogs, see Gait (dog). For general locomotion, see Gait. For other uses, see Running (disambiguation).

Running is a means of terrestrial locomotion allowing humans and other animals to move rapidly on foot. It is simply defined in athletics terms as a gait in which at regular points during the running cycle both feet are off the ground. This is in contrast to walking, where one foot is always in contact with the ground, the legs are kept mostly straight and the center of gravity vaults over the legs in an inverted pendulum fashion. A characteristic feature of a running body from the viewpoint of spring-mass mechanics, is that changes in kinetic and potential energy within a stride occur simultaneously, with energy storage accomplished by springy tendons and passive muscle elasticity.The term running can refer to any of a variety of speeds ranging from jogging to sprinting.

The ancestors of mankind developed the ability to run for long distances about four and a half million years ago[citation needed], probably in order to hunt animals. Competitive running grew out of religious festivals in various areas. Records of competitive racing date back to the Tailteann Games in Ireland in 1829 BCE, while the first recorded Olympic Games took place in 776 BCE.

Running motion.

History

It is thought that human running evolved at least four and a half million years ago out of the ability of the ape-like Australopithecus, an early ancestor of humans, to walk upright on two legs.The scientists, Dennis Bramble and Daniel Lieberman, have put forward a theory that early man developed as an endurance runner in order to hunt animals, and that human features such as the nuchal ligament, abundant sweat glands, the Achilles tendons, big knee joints and muscular glutei maximi, were a response to that running development.

Competitive running grew out of religious festivals in various areas such as Greece, Egypt, Asia, and the Rift Valley in Africa. The Tailteann Games, an Irish sporting festival in honour of the goddess Tailtiu, dates back to 1829 BCE, and is one of the earliest records of competitive running. The origins of the Olympics are shrouded in myth, though the first recorded game took place in 776 BCE.

Motion

Humans leap from one leg to the other while running. Each leap raises the center of gravity during take-off and lowers it on landing as the knee bends to absorb the shock. At mid arc, both feet are momentarily off the ground. This continual rise and fall of bodyweight expends energy opposing gravity and absorbing shock during take-off and landing. Running on a track requires more energy than walking to cover the same distance due to air resistance at higher speeds. As reported by Hall et al. males on a track running at a pace of 6.3 mph use 1.20 times as much energy to travel the same distance as walking at a pace of 3.15 mph, but on a treadmill running 6.3 mph uses just 1.01 times as much energy to travel the same distance as walking at 3.15 mph. Therefore, running is less efficient than walking in terms of calories expended per unit distance, though it is faster.

In 2004, scientists at the University of Utah and Harvard University hypothesized that the ability of humans to sustain long-distance endurance running may have been instrumental in the evolution of the human form.

Lower body motion

Running is executed as a sequence of strides, which alternate between the two legs. Each leg's stride can be roughly divided into three phases: support, drive, and recovery. Support and drive occur when the foot is in contact with the ground. Recovery occurs when the foot is off the ground. Since only one foot is on the ground at a time in running, one leg is always in recovery, while the other goes through support and drive. Then, briefly, as the runner leaps through the air, both legs are in recovery. These phases are described in detail below.

Support

During the support phase, the foot is in contact with the ground and supports the body against gravity. The body's centre of mass is typically somewhere in the lower abdominal area between the hips. The supporting foot touches the ground slightly ahead of the point that lies directly below the body's centre of mass. The knee joint is at its greatest extension just prior to the support phase. When contact is made with the ground, the knee joint begins to flex, and the extent it flexes varies with running style. Stiff-legged running styles reduce knee flexion, and looser, or more dynamic, running styles increase it. As the supporting leg bends at the knee, the pelvis dips down on the opposite side. These motions absorb shock and are opposed by the coordinated action of several muscles. The pelvic dip is opposed by the tensor fasciae lataeilio-tibial band of the supporting leg, the hip abductor, and the abdominals and lower back muscles. The knee flexion is opposed by the Muscle contraction[clarification needed] eccentric contraction of the quadriceps muscle. The supporting hip continues to extend, and the body's centre of mass passes over the supporting leg. The knee then begins to extend, and the opposite hip rises from its brief dip. The support phase begins to transition into drive.
Drive

The support phase quickly transitions into the drive phase. The drive leg extends at the knee joint, and at the hips, such that the toe maintains contact with the ground as that leg trails behind the body. The foot pushes backward and also down, creating a diagonal force vector, which, in an efficient running style, is aimed squarely at the runner's centre of mass. Since the diagonal vector has a vertical component, the drive phase continues to provide some support against gravity and can be regarded as an extension of the support phase. During the drive, the foot may extend also, by a flexing of the soleus and gastrocnemius muscle in the calf. In some running styles, notably long-distance "shuffles" which keep the feet close to the ground, the ankle remains more or less rigid during drive. Because the knee joint straightens, though not completely, much of the power of the drive comes from the quadriceps muscle group, and in some running styles, additional power comes from the calves as they extend the foot for a longer drive. This motion is most exhibited in sprinting.

There has been much discussion about the exact nature of the drive phase, because it has now been shown scientifically that the quadriceps have no activity after the supporting phase; this has become known as the extensor paradox in running.[9] Essentially, the body automatically turns off the quadriceps after the body weight moves forward of its supporting foot. This has led to a hypothesis that there is no driving phase in running, and that the runner's own body weight is providing the propulsion during this time, essentially falling through a gravitational torque created as the general centres of mass of the runner is in a forward position from the supporting foot.
Recovery

When the driving toe loses contact with the ground, the recovery phase begins. During recovery, the hip flexes, which rapidly drives the knee forward. Much of the motion of the lower leg is driven by the forces transferred from the upper leg rather than by the action of the muscles. As the knee kicks forward, it exerts torque against the lower leg through the knee joint, causing the leg to snap upward. The degree of leg lift can be consciously adjusted by the runner, with additional muscle power. During the last stage of recovery, the hip achieves maximal flexion, and, as the lower leg rapidly unfolds, which it does in a passive way, the knee joint also reaches its greatest, though not full, extension. During this extension of the leg and flexion of the hip, the hamstring and gluteal muscles are required to stretch rapidly. Muscles which are stretched respond by contracting by a reflex action. Recovery ends when the foot comes into contact with the ground, transitioning again into the support phase.

Upper body motion

The motions of the upper body are essential to maintaining balance, and a forward motion for optimal running. They compensate for the motions of the lower body, keeping the body in rotational balance. A leg's recovery is matched by a forward drive of the opposite arm, and a leg's support and drive motions are balanced by backward movement of the opposite arm. The shoulders and torso are also involved. Because the leg drive is slower than the kick of recovery, the arm thrusting backward is slower also. The forward arm drive is more forceful and rapid.

The more force exerted by the lower body, the more exaggerated the upper body motions have to be to absorb the momentum. While it is possible to run without movements of the arms, the spine and shoulders will generally still be recruited. Using the arms to absorb the forces aids in maintaining balance at higher speed. Otherwise, optimal force would be hard to attain for fear of falling over.

Most of the energy expended in running goes to the compensating motions, and so considerable gains in running speed as well as economy can be made by eliminating wasteful or incorrect motions. For instance, if the force vector in the drive phase is aimed too far away from the centre of mass of the body, it will transfer an angular momentum to the body which has to be absorbed.

The faster the running, the more energy has to be dissipated through compensating motions throughout the entire body. This is why elite sprinters have powerful upper body physiques. As the competitive distance increases, there is a rapid drop in the upper body and overall muscle mass typically exhibited by the people who compete at a high level in each respective event. Long distance runners typically have lean muscles.
Elements of good running technique

Upright posture and a slight forward lean

Leaning forward places a runner's center of mass on the front part of the foot, which avoids landing on the heel and facilitates the use of the spring mechanism of the foot. It also makes it easier for the runner to avoid landing the foot in front of the center of mass and the resultant braking effect. While upright posture is essential, a runner should maintain a relaxed frame and use his/her core to keep posture upright and stable. This helps prevent injury as long as the body is neither rigid nor tense. The most common running mistakes are tilting the chin up and scrunching shoulders.[citation needed]

Stride rate and types

Exercise physiologists have found that the stride rates are extremely consistent across professional runners, between 185 and 200 steps per minute. The main difference between long- and short-distance runners is the length of stride rather than the rate of stride.

During running, the speed at which the runner moves may be calculated by multiplying the cadence (steps per second) by the stride length. Running is often measured in terms of pace in minutes per mile or kilometer. Fast stride rates coincide with the rate one pumps one's arms. The faster one's arms move up and down, parallel with the body, the faster the rate of stride. Different types of stride are necessary for different types of running. When sprinting, runners stay on their toes bringing their legs up, using shorter and faster strides. Long distance runners tend to have more relaxed strides that vary.
Running injuries

Because of its high-impact nature, many injuries are associated with running. They include "runner's knee" (pain in the knee), shin splints, pulled muscles (especially the hamstring), twisted ankles, iliotibial band syndrome, plantar fasciitis, Achilles tendinitis, and stress fractures.[citation needed] Repetitive stress on the same tissues without enough time for recovery or running with improper form can lead to many of the above. Runners generally attempt to minimize these injuries by warming up before exercise, focusing on proper running form, performing strength training exercises, eating a well balanced diet, allowing time for recovery, and "icing" (applying ice to sore muscles or taking an ice bath).[citation needed]

Foot blisters are also common among runners. Specialized socks greatly help to prevent blisters.

Another common, running-related injury is chafing, caused by repetitive rubbing of one piece of skin against another, or against an article of clothing. One common location for chafe to occur is the runner's upper thighs. The skin feels coarse and develops a rash-like look. A variety of deodorants and special anti-chafing creams are available to treat such problems. Chafe is also likely to occur on the nipple.

A cold bath is a popular treatment of subacute injuries or inflammation, muscular strains, and overall muscular soreness, but its efficacy is controversial. Some claim that for runners in particular, ice baths offer two distinct improvements over traditional techniques.[who?] First, immersion allows controlled, even constriction around all muscles, effectively closing microscopic damage that cannot be felt and numbing the pain that can. One may step into the tub to relieve sore calves, quads, hams, and connective tissues from hips to toes will gain the same benefits, making hydrotherapy an attractive preventive regimen. Saint Andrew's cross-country coach John O’Connell, a 2:48 masters marathoner, will hit the ice baths before the ibuprofen. "Pain relievers can disguise injury", he warns. "Ice baths treat both injury and soreness." The second advantage involves a physiological reaction provoked by the large amount of muscle submerged. Assuming one has overcome the mind's initial flight response in those first torturous minutes, the body fights back by invoking a "blood rush". This rapid transmission circulation flushes the damage-inflicting waste from the system, while the cold water on the outside preserves contraction. Like an oil change or a fluid dump, the blood rush revitalizes the very areas that demand fresh nutrients.

Some runners may experience injuries when running on concrete surfaces. The problem with running on concrete is that the body adjusts to this flat surface running and some of the muscles will become weaker, along with the added impact of running on a harder surface. Therefore it is advised to change terrain occasionally – such as trail, beach, or grass running. This is more unstable ground and allows the legs to strengthen different muscles. Runners should be wary of twisting their ankles on such terrain. Running downhill also increases knee stress and should therefore be avoided. Reducing the frequency and duration can also prevent injury.

Another injury prevention method common in the running community is stretching. Stretching is often recommended as a requirement to avoid running injuries, and it is almost uniformly performed by competitive runners of any level. Recent medical literature, however, finds mixed effects of stretching prior to running. One study found insufficient evidence to support the claim that stretching prior to running was effective in injury prevention or soreness reductionAnother, however, has demonstrated that stretching prior to running increases injuries, while stretching afterwards actually decreases them. The American College of Sports Medicine recommends that all stretching be done after exercise because this is when the muscles are most warmed up and capable of increasing flexibility. Recent studies have also shown that stretching will reduce the amount of strength the muscle can produce during that training session.

Barefoot running has been promoted as a means of reducing running related injuries though this position on barefoot running remains controversial and a majority of professionals advocate the wearing of appropriate shoes as the best method for avoiding injury.

Recent studies have shown that runners do not have more osteoarthritis than people who do not run.

Benefits of running

While there is the potential for injury in running (just as there is in any sport), there are many benefits. Some of these benefits include potential weight loss, improved cardiovascular and respiratory health (reducing the risk of cardiovascular and respiratory diseases), improved cardiovascular fitness, reduced total blood cholesterol, strengthening of bones (and potentially increased bone density), possible strengthening of the immune system and an improved self esteem and emotional state. Running, like all forms of regular exercise, can effectively slow or reverse the effects of aging.

Running can assist people in losing weight, staying in shape and improving body composition. Running increases your metabolism. Different speeds and distances are appropriate for different individual health and fitness levels. For new runners, it takes time to get into shape. The key is consistency and a slow increase in speed and distance. While running, it is best to pay attention to how one's body feels. If a runner is gasping for breath or feels exhausted while running, it may be beneficial to slow down or try a shorter distance for a few weeks. If a runner feels that the pace or distance is no longer challenging, then the runner may want to speed up or run farther.[citation needed]

Running can also have psychological benefits, as many participants in the sport report feeling an elated, euphoric state, often referred to as a "runner's high".Running is frequently recommended as therapy for people with clinical depression and people coping with addiction. A possible benefit may be the enjoyment of nature and scenery, which also improves psychological well-being (see Ecopsychology#Practical benefits).

In animal models, running has been shown to increase the number of newly born neurons within the brain. This finding could have significant implications in aging as well as learning and memory.
Running events

Running is both a competition and a type of training for sports that have running or endurance components. As a sport, it is split into events divided by distance and sometimes includes permutations such as the obstacles in steeplechase and hurdles. Running races are contests to determine which of the competitors is able to run a certain distance in the shortest time. Today, competitive running events make up the core of the sport of athletics. Events are usually grouped into several classes, each requiring substantially different athletic strengths and involving different tactics, training methods, and types of competitors.

Running competitions have probably existed for most of humanity's history and were a key part of the ancient Olympic Games as well as the modern Olympics. The activity of running went through a period of widespread popularity in the United States during the running boom of the 1970's. Over the next two decades, as many as 25 million Americans were doing some form of running or jogging – accounting for roughly one tenth of the population.[27] Today, road racing is a popular sport among non-professional athletes, who included over 7.7 million people in America alone in 2002.

Limits of speed

Footspeed, or sprint speed, is the maximum speed at which a human can run. It is affected by many factors, varies greatly throughout the population, and is important in athletics and many sports.

The fastest human footspeed on record is 44.72 km/h (27.79 mph), seen during a 100 meter sprint (average speed between the 60th and the 80th meter) by Usain Bolt.

Events by type

Track running

Track running events are individual or relay events with athletes racing over specified distances on an oval running track. The events are categorised as sprints, middle and long-distance, and hurdling.

Road running

Road running takes place on a measured course over an established road (as opposed to track and cross country running). These events normally range from distances of 5 kilometers to longer distances such as half marathons and marathons, and they may involve large numbers of runners or wheelchair entrants.

Cross country running

Cross country running takes place over open or rough terrain. The courses used at these events may include grass, mud, woodlands, hills, flat ground and water. It is a popular participatory sport, and is one of the events which, along with track and field, road running, and racewalking, makes up the umbrella sport of athletics.

Events by distance

Sprints

Sprints are short running events in athletics and track and field. Races over short distances are among the oldest running competitions. The first 13 editions of the Ancient Olympic Games featured only one event – the stadion race, which was a race from one end of the stadium to the other.There are three sprinting events which are currently held at the Olympics and outdoor World Championships: the 100 metres, 200 metres, and 400 metres. These events have their roots in races of imperial measurements which were later altered to metric: the 100 m evolved from the 100 yard dash, the 200 m distances came from the furlong (or 1/8 of a mile), and the 400 m was the successor to the 440 yard dash or quarter-mile race.

At the professional level, sprinters begin the race by assuming a crouching position in the starting blocks before leaning forward and gradually moving into an upright position as the race progresses and momentum is gained. Athletes remain in the same lane on the running track throughout all sprinting events, with the sole exception of the 400 m indoors. Races up to 100 m are largely focused upon acceleration to an athlete's maximum speed.All sprints beyond this distance increasingly incorporate an element of endurance. Human physiology dictates that a runner's near-top speed cannot be maintained for more than thirty seconds or so as lactic acid builds up and leg muscles begin to be deprived of oxygen.

The 60 metres is a common indoor event and it an indoor world championship event. Other less-common events include the 50 metres, 55 metres, 300 metres and 500 metres which are used in some high and collegiate competitions in the United States. The 150 metres, though rarely competed, has a star-studded history: Pietro Mennea set a world best in 198Olympic champions Michael Johnson and Donovan Bailey went head-to-head over the distance in 1997, and Usain Bolt improved Mennea's record in 2009.

Middle distance

Main article: Middle distance running

Middle distance running events are track races longer than sprints up to 3000 metres. The standard middle distances are the 800 metres, 1500 metres and mile run, although the 3000 metres may also be classified as a middle distance event. The 880 yard run, or half mile, was the forebear to the 800 m distance and it has its roots in competitions in the United Kingdom in the 1830s.The 1500 m came about as a result of running three laps of a 500 m track, which was commonplace in continental Europe in the 1900s.
Long distance
Marathon
Ultrarunning
Multiday running

The images of during Running:

Running motion.

Rugby football | Best of Rugby football | Images of Rugby football | Photos of Rugby football

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Rugby football

Rugby football is a style of football named after Rugby School in the United Kingdom. It is seen most prominently in two current sports, rugby league and rugby union. See comparison of rugby league and rugby union.

Rugby football.

History

Rugby football developed from a version of football played at Rugby School and was originally one of several versions of football played at English public schools during the 19th century.

The game of football that was played at Rugby School between 1750 and 1859 permitted handling of the ball, but players were not allowed to run with it in their hands towards the opposition's goal.[citation needed] With no limit to the number of players per side, sometimes hundreds would participate in an enormous rolling maul, sometimes resulting in major injuries. The innovation of running with the ball was introduced between 1859 and 1865. The popular myth of the sport's origin states that Rugby pupil William Webb Ellis broke the local rules by running forward with the ball in his hands in 1823. Rugby School produced the first written rules for their version of the sport in 1845.

In the result that the teams were still tied at the end of the match, a drop goal shootout was held. The selected kickers of the two teams would have one shot at the goal each and would take turns shooting at the goal until one of the kickers missed

Rugby football

Status of rugby codes in various countries

Rugby union is both a professional and amateur game, and is dominated by the first tier unions: Argentina, Australia, England, France, Ireland, Italy, New Zealand, Scotland, South Africa and Wales. Second and third tier unions include Brazil, Canada, Chile, Colombia, Fiji, Georgia, Japan, Namibia , Peru , Portugal, Romania, Samoa, Spain, Tonga, the United States and Uruguay. Rugby Union is administered by the International Rugby Board (IRB), whose headquarters are located in Dublin, Ireland. It is the national sport in New Zealand, South Africa, Wales, Fiji, Samoa, Tonga and Madagascar, and is the most popular form of rugby globally, with the seven-a-side version of the game, known as Rugby Sevens, having been admitted into the programme of the Olympic Games from Rio de Janeiro in 2016 onwards. There is also a possibility that Rugby Sevens will also be a demonstration sport at the 2012 London Olympics.

In Canada and the United States rugby union evolved into the American football and Canadian football. The primary difference is that the quarterback can make a forward lateral pass behind the line of scrimmage (the line where the last play ended), and the system of down-and-distance rules. One team is given possession of the ball and must gain 10 yards in so many downs (4 for American football, and 3 for Canadian football).

Rugby league is also both a professional and amateur game, administered on a global level by the Rugby League International Federation. In addition to amateur and semi-professional competitions in the United States, Russia, Lebanon, Serbia, Europe and Australasia, there are two major professional competitions – the Australasian National Rugby League and the European Super League. International Rugby League is dominated by Australia, England and New Zealand. Other nations from the South Pacific and Europe also play in the Pacific Cup and European Cup respectively.

Laws

Further information: Comparison of rugby league and rugby union, Laws of rugby league, and Rugby union numbering schemes

Distinctive features common to both rugby codes include the oval ball and the ban on throwing the ball forward, so that players can gain ground only by running with the ball or by kicking it. As the sport of rugby league moved further away from its union counterpart, rule changes were implemented with the aim of making a faster-paced and more try-orientated game.

The main differences between the two games, besides league having teams of 13 players and union of 15, involve the tackle and its aftermath:
Union players contest possession following the tackle: depending on the situation, either a ruck or a maul can occur. League players may not contest possession after making a tackle: play is continued with a play-the-ball.
In league, if the team in possession fails to score before a set of six tackles, it surrenders possession. Union has no six-tackle rule; a team can keep the ball for an unlimited number of tackles before scoring as long as it maintains possession and does not commit an offence.

Set pieces of the union code include the "scrum", in which packs of opposing players push against each other for possession, and the "line-out", in which parallel lines of players from each team, arranged perpendicular to the touch-line, attempt to catch the ball thrown from touch. A rule has been added to line-outs which allows the jumper to be pulled down once a players's feet are on the ground.

In the league code, the scrum still exists, but with greatly reduced importance as it involves fewer players and is rarely contested. Set pieces are generally started from the play-the-ball situation. Many of the rugby league positions have similar names and requirements to rugby union positions, but there are no flankers in rugby league.

Culture

The Home Countries

In England, rugby union is widely regarded as an "establishment" sport, played mostly by members of the upper and middle classes. For example, many students at private schools and grammar schools play rugby union. In contrast, rugby league has traditionally been seen as a working class pursuit. An exception to this stereotype is evident in the neighbouring countries of England and Wales. In England rugby union is associated with the public school system. In Wales, rugby is associated with small village teams which consisted of coal miners and other industrial workers playing on their days off. In Ireland, and in particular Leinster, rugby union is also associated with private education and the "D4" stereotype, and this image of the spoilt, ignorant, wealthy rugby-playing jock inspired the best-selling Ross O'Carroll Kelly novels.

In Australia support for both codes is concentrated in New South Wales, Queensland and the Australian Capital Territory (see Barassi Line). The same perceived class barrier as exists between the two games in England also occurs in these states, fostered by rugby union's prominence and support at private schools.

Exceptions to the above include New Zealand (although league is still considered to be a lower class game by many, or a game for 'westies' referring to lower class western suburbs of Auckland and more recently the poorer southern Auckland where the game is popular), Wales, France except Paris, Cornwall, Gloucestershire, Somerset, the Borders region of Scotland, County Limerick in Ireland (see Munster), and the Pacific Islands, where rugby union is popular in working class communities. Nevertheless, Rugby League is perceived as the game of the working class people in northern England,and in the Australian states of New South Wales and Queensland.

In the United Kingdom, rugby union fans sometimes use the term "rugger" as an alternative name for the sport, (see Oxford '-er'). New Zealanders refer to rugby in general as "footy" or "football", rugby union simply as either "rugby" or "union" and to rugby league as "rugby league" or "league". In the U.S., people who play rugby are sometimes called "ruggers", a term little used elsewhere except facetiously.

Those considered to be heavily involved with the rugby union lifestyle—including heavy drinking and striped jumpers – sometimes identify as “rugger buggers”.[citation needed]

The Rest of the World

In France, rugby is widely played and has a strong tradition in the Basque people along the border regions between Spain and France. It rivals the popularity of Association Football. The game is very popular in South Africa among both blacks and whites, having been introduced by English-speaking settlers in the 19th century. British colonists also brought the game with them to Australia and New Zealand, where the game is widely played. It has spread thence to much of Polynesia, having particularly strong followings in Fiji, Samoa, and Tonga.

Rugby ball

In rugby union, the International Rugby Board the size and shape of the ball under Law 2(also known as Law E.R.B); an official rugby union ball is oval and made of four panels, has a length in-line of 280–300 millimetres, a circumference (end to end) of 740–770 millimetres, and a circumference (in width) of 580–620 millimetres. It is made of leather or suitable synthetic material, and may be treated to make it water resistant and easier to grip. The rugby ball may not weigh more than 460 grams or less than 410 and has an air pressure of 65.71–68.75 kilopascals, or 0.67–0.70 kilograms per square centimetre, or 9.5–10.0 lbs per square inch. Spare balls are allowed under the condition that players or teams do not seek an advantage by changing the ball. Smaller sized balls may also be used in games between younger players. Much larger versions of traditional balls are also available for purchase, but these are mainly for their novelty attraction.

Rugby football

Rugby shirt

Rugby shirts were formerly made of cotton but are now made of a cotton and polyester mix. This material has the advantage of not absorbing as much water or mud as cotton alone.

The rugby jerseys are slightly different depending on the type of rugby game played. The shirts worn by rugby league players commonly have a large "V" around the neck and they also tend to be more colourful than the rugby union jerseys. The players in the rugby union wear jerseys with a more traditional design, sometimes completely white (Cahors Rugby in France). However, most of the players in rugby union wear one color jerseys with a different color stripes.The number of the player and his or her surname are placed on the upper back of the jersey (often name above number, with the number being significantly larger and more central), and the logo of the team on the upper left chest.

The Images of the player while Playing Rugby.

Rugby Football.

Snooker

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Snooker

Snooker (English pronunciation: /ˈsnuːkə(r)/ or /ˈsnʊkər/[citation needed]) is a cue sport that is played on a green baize-covered table with pockets in each of the four corners and in the middle of each of the long side cushions. A regular (full-size) table is 12 × 6 ft (3.7 × 1.8 m). It is played using a cue and 22 snooker balls: one white cue ball, 15 red balls worth one point each, and six balls of different colours: yellow (2 points), green (3), brown (4), blue (5), pink (6) and black (7). A player (or team) wins a frame (individual game) of snooker by scoring more points than the opponent(s), using the cue ball to pot the red and coloured balls. A player wins a match when a certain number of frames have been won.

Snooker, generally regarded as having been invented in India by British Army officers, is popular in many of the English-speaking and Commonwealth countries, with top professional players attaining multi-million pound career earnings from the game. The sport is now increasingly popular in China.

Snooker.

It is commonly accepted that snooker originated in the later half of the 19th century. Billiards had been a popular activity amongst British Army officers stationed in India, and variations on the more traditional billiard games were devised. One variation, devised in the officers' mess in Jabalpur during 1874 or 1875, was to add coloured balls in addition to the reds and black which were used for pyramid pool and life pool.The word snooker also has military origins, being a slang term for first-year cadets or inexperienced personnel. One version of events states that Colonel Sir Neville Chamberlain of the Devonshire regiment was playing this new game when his opponent failed to pot a ball and Chamberlain called him a snooker. It thus became attached to the billiards game now bearing its name as inexperienced players were labelled as snookers.

The game of snooker grew in the latter half of the 19th century and the early 20th century, and by 1927 the first World Snooker Championship had been organised by Joe Davis who, as a professional English billiards and snooker player, moved the game from a pastime activity into a more professional sphere.Joe Davis won every world championship until 1946 when he retired. The game went into a decline through the 1950s and 1960s with little interest generated outside of those who played. In 1959, Davis introduced a variation of the game, known as snooker plus, to try to improve the game's popularity by adding two extra colours. However, it never caught on.

A major advance occurred in 1969, when David Attenborough commissioned the snooker tournament Pot Black to demonstrate the potential of colour television, with the green table and multi-coloured balls being ideal for showing off the advantages of colour broadcasting. The TV series became a ratings success and was for a time the second most popular show on BBC Two. Interest in the game increased and the 1978 World Championship was the first to be fully televised. The game quickly became a mainstream sport in the UK, Ireland and much of the Commonwealth and has enjoyed much success in the last 30 years, with most of the ranking tournaments being televised. In 1985 a total of 18.5 million viewers watched the concluding frame of the world championship final between Dennis Taylor and Steve Davis. In recent years the loss of tobacco sponsorship has led to a decrease in the number of professional tournaments, although some new sponsors have been sourced;and the popularity of the game in the Far East and China, with emerging talents such as Liang Wenbo and more established players such as Ding Junhui and Marco Fu, bodes well for the future of the sport in that part of the world.

Snooker.

The game

Snooker.

The object of the game is to score more points than the opponent by potting object balls in a predefined order. At the start of a frame, the balls are positioned as shown and the players take turns to hit a shot in a single strike from the tip of the cue, their aim being to pot one of the red balls and score a point. Whenever a red ball is potted, the shooter is allowed to pot one of the colours. If successful, they score the value of the colour potted, and it is returned to its correct position on the table. This process continues until they fail to pot the desired ball, at which point their opponent comes back to the table to play the next shot. The game continues in this manner until all the reds are potted and only the 6 colours are left on the table; at that point the aim is to pot the colours in the order yellow 2, green 3, brown 4, blue 5, pink 6, black 7, with the balls not being returned to play. When the final ball is potted, the player with the most points wins.

Points may also be scored in a game when a player's opponent fouls. A foul can occur for numerous reasons, such as hitting a colour first when the player was attempting to hit a red, potting the cue ball, or failing to escape from "a snooker" (a situation where the previous player finished their turn leaving the cue ball in a position where the object ball cannot be hit directly). Points gained from a foul vary from a minimum of 4 to a maximum of 7 if the black ball is involved.

Professional and competitive amateur matches are officiated by a referee who is the sole judge of fair play. The referee also respots the colours on to the table and calls out how many points the player has scored during a break. Professional players usually play the game in a sporting manner, declaring fouls the referee has missed, acknowledging good shots from their opponent, or holding up a hand to apologise for fortunate shots.

Snooker.

Accessories used for snooker include chalk for the tip of the cue, rests of various sorts (needed often, due to the length of a full-size table), a triangle to rack the reds, and a scoreboard. One drawback of snooker on a full-size table is the size of the room (22 by 16 feet (6.7 × 4.9 m)), which is the minimum required for comfortable cueing room on all sides. This limits the number of locations in which the game can easily be played. While pool tables are common to many pubs, snooker tends to be played either in private surroundings or in public snooker halls. The game can also be played on smaller tables using fewer red balls. The variants in table size are: 10' × 5', 9' × 4.5', 8' × 4', 6' × 3' (the smallest for realistic play) and 4' × 2'. Smaller tables can come in a variety of styles, such as fold away or dining-table convertible.

Snooker.

Governance and tournaments

The World Professional Billiards and Snooker Association (WPBSA, also known as World Snooker), founded in 1968 as the Professional Billiard Players' Association, is the governing body for the professional game. Its subsidiary, World Snooker, based in Bristol, England, organises the professional tour. Over the years the board of the WPBSA has changed many times, which some argue is an indication of in-fighting within the sport.The amateur game is governed by the International Billiards and Snooker Federation (IBSF).

Professional snooker players can play on the World Snooker main tour ranking circuit. Ranking points, earned by players through their performances over the previous two seasons, determine the current world ranking. A player's ranking determines what level of qualification they require for ranking tournaments. The elite of professional snooker is generally regarded as the "Top 16" ranking players, who are not required to pre-qualify for any of the tournaments. The tour contains 96 players – the top 64 from the previous two seasons, the 8 highest ranked professional players on the Players Tour Championship Order of Merit who are not in the top 64, 12 players from the Q School, and various regional, junior and amateur champions.

The most important event in professional snooker is the World Championship, held annually since 1927 (except during the World War II and between 1958 and 1963). The tournament has been held at the Crucible Theatre in Sheffield, England since 1977, and was sponsored by Embassy from 1976 to 2005. Since 2005, tobacco companies have not been allowed to sponsor sporting events in the United Kingdom, and the World Championship had to find a new sponsor. It was announced in January 2006 that the 2006–2010 world championships would be sponsored by online casino 888.com. The Championship is currently sponsored by BetFred.com after 888.com pulled out of their five year sponsorship deal after three years. On 15 April 2009 the World Snooker Championship website announced that Betfred.com would be the new sponsor of the World Championship for the next four years.

The group of tournaments that come next in importance are the other ranking tournaments. Players in these tournaments score world ranking points. A high ranking ensures qualification for next year's tournaments, invitations to invitational tournaments and an advantageous draw in tournaments.The most prestigious of these after the World Championship is the UK Championship. Third in line are the invitational tournaments, to which most of the highest ranked players are invited. The most important tournament in this category is The Masters, which to most players is the second or third most sought-after prize.

In an attempt to answer criticisms that televised matches can be slow or get bogged down in lengthy safety exchanges and that long matches causes problems for advertisers,an alternative series of timed tournaments has been organised by Matchroom Sport Chairman Barry Hearn. The shot-timed Premier League Snooker was established, with seven players invited to compete at regular United Kingdom venues, televised on Sky Sports. Players have twenty-five seconds to take each shot, with five time-outs per player per match. While some success has been achieved with this format it generally does not receive the same amount of press attention or status as the regular ranking tournaments.

There are also other tournaments that have less importance, earn no world ranking points and are not televised. These can change on a year-to-year basis depending on calendars and sponsors.

Equipment

Chalk.

Chalk
The tip of the cue is 'chalked' to ensure good contact between the cue and the cue-ball.
Cue
A stick, made of wood or fibreglass, the tip of which is used to strike the cue-ball.
Extension
A shorter baton that fits over, or screws into, the back end of the cue, effectively lengthening it. Is used for shots where the cue-ball is a long distance from the player.
Rest
A stick with an X-shaped head that is used to support the cue when the cue ball is out of reach at normal extension.

Rest head adaptor

An attachment that slips onto a conventional rest head to make a spider or just to give a slightly different bridge.
Hook rest
Identical to the normal rest, yet with a hooked metal end. It is used to set the rest around another ball. The hook rest is the most recent invention in snooker.

Spider

Similar to the rest but with an arch-shaped head; it is used to elevate and support the tip of the cue above the height of the cue-ball.
Swan (or swan-neck spider)
This equipment, consisting of a rest with a single extended neck and a fork-like prong at the end, is used to give extra cueing distance over a group of balls.
Triangle/Rack
The piece of equipment is used for gathering the red balls into the formation required for the break to start a frame.
Extended rest
Similar to the regular rest, but with a mechanism at the butt end which makes it possible to extend the rest by up to three feet.

Extended spider

A hybrid of the swan and the spider. Its purpose is to bridge over large packs of reds. Is less common these days in professional snooker but can be used in situations where the position of one or more balls prevents the spider being placed where the striker desires.
Half butt
Usually housed underneath the side of the table, the half butt is a combination of a table length rest and cue which is rarely used unless the cue ball needs to be struck in such a way that the entire length of the table is the actual obstacle.

Ball marker

A multi-purpose instrument with a 'D' shaped notch, which a referee can (1) place next to a ball, in order to mark the position of it. They can then remove the ball to clean it; (2) use to judge if a ball is preventing a colour from being placed on its spot; (3) use to judge if the cue ball can hit the extreme edge of a "ball on" when awarding a free ball (by placing it alongside the potentially intervening ball).

Notable players

In the professional era that began with Joe Davis in the 1930s and continues up until the present day, a relatively small number of players have succeeded at the top level. Reaching and maintaining a place amongst the snooker elite is a tough task, with the standards of the game being such that it requires many years of dedication and effort as well as natural ability.

Certain players have tended to dominate the sport through the decades. John Pulman is generally regarded as the principal player through the 1960s, Ray Reardon through the 1970s, Steve Davis through the 1980s and Stephen Hendry through the 1990s, winning 6 (1970, 1973–76 and 1978), 6 (1981, 1983, 1984 and 1987–89) and 7 (1990, 1992–96 and 1999) World Championships respectively. No one dominated in the 2000s, however Ronnie O'Sullivan winning the title on three occasions (2001, 2004 and 2008) and Mark Williams and John Higgins winning twice (2000, 2003 and 2007, 2009 respectively). Higgins has four world titles in total, having won his first title in 1998 and his fourth in 2011. Last successful title defence was in 1996 when Hendry won the sixth of his seven titles (and 5th in a row).

The Images of the snooker players while playing snooker.