12/08/2011

Tennis

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Tennis
The US Open is a prestigious Grand Slam tournament.
Tennis is a sport usually played between two players (singles) or between two teams of two players each (doubles). Each player uses a racket that is strung to strike a hollow rubber ball covered with felt over a net into the opponent's court. Tennis is an Olympic sport and is played at all levels of society at all ages. The sport can be played by anyone who can hold a racket, including people in wheelchairs.
The modern game of tennis originated in Birmingham, England in the late 19th century as "lawn tennis" which has close connections to various field/lawn games as well as to the ancient game of real tennis. Up to then, "tennis" referred to the latter sport: for example, in Disraeli's novel Sybil (1845), Lord Eugene De Vere announces that he will "go down to Hampton Court and play tennis. As it is the Derby [classic horse race], nobody will be there".[1] After its creation, lawn tennis spread throughout the upper-class English-speaking population before spreading around the world.[2]
The rules of tennis have not changed much since the 1890s. Two exceptions are that from 1908 to 1961 the server had to keep one foot on the ground at all times, and the adoption of the tie-break in the 1970s. A recent addition to professional tennis has been the adoption of electronic review technology coupled with a point challenge system, which allows a player to challenge the line (or chair) umpire's call of a point. Players have unlimited opportunities to challenge provided the challenges made are correct. However, once three incorrect challenges are made in a set, they cannot challenge again until the next set. If the set goes to a tie break, players are given one additional opportunity to challenge the call. This electronic review, currently called Hawk-Eye, is available at a limited number of high-level ATP and WTA tournaments.
Tennis is enjoyed by millions of recreational players and is also a hugely popular worldwide spectator sport, especially the four Grand Slam tournaments (also referred to as the "Majors"): the Australian Open played on hard courts, the French Open played on red clay courts, Wimbledon played on grass courts, and the US Open played also on hard courts.

History

While the modern game of tennis originated in late 19th century England, most historians believe that the games ancient origin is from 12th century France, but the ball was then struck with the palm of the hand. It was not until the 16th century that rackets came into use, and the game began to be called "tennis", from the Old French term Tenez, which can be translated as "hold!", "receive!" or "take!". An interjection used as a call from the server to his opponent.[3] It was popular in England and France, although the game was only played indoors where the ball could be hit off the wall. Henry VIII of England was a big fan of this game, which is now known as real tennis.[4] During the 18th century and early 19th century, as real tennis declined, new racquets sports emerged in England.[5]
Between 1859 and 1865 Harry Gem and his friend Augurio Perera developed a game that combined elements of rackets and the Basque ball game pelota, which they played on Perera's croquet lawn in Birmingham, United Kingdom.[6][7] In 1872, along with two local doctors, they founded the world's first tennis club in Leamington Spa.[8]
Lawn tennis in the U.S., 1887

In December 1873, Major Walter Clopton Wingfield designed and patented a similar game — which he called sphairistike (Greek: σφάίρίστική, from ancient Greek meaning "skill at playing at ball"), and was soon known simply as "sticky" — for the amusement of his guests at a garden party on his estate of Nantclwyd, in Llanelidan, Wales.[9] Sport historians agree that Wingfield deserves much of the credit for the development of modern tennis.[5][10] The world's oldest tennis tournament, the Wimbledon championships, were first played in London in 1877.[11][12] The first Championships culminated a significant debate on how to standardize the rules.
In America in 1874 Mary Ewing Outerbridge, a young socialite, returned from Bermuda where she met Major Wingfield. She laid out a tennis court at the Staten Island Cricket Club in New Brighton Staten Island, New York. The exact location of the club was under what is now the Staten Island Ferry terminal. The first American National tournament in 1880 was played there. An Englishman named O.E Woodhouse won the singles match. There was also a doubles match which was won by a local pair. There were different rules at each club. The ball in Boston was larger than the one normally used in NY. On May 21, 1881, the United States National Lawn Tennis Association (now the United States Tennis Association) was formed to standardize the rules and organize competitions.[13] The U.S. National Men's Singles Championship, now the US Open, was first held in 1881 at Newport, Rhode Island.[14] The U.S. National Women's Singles Championships were first held in 1887.[15] Tennis was also popular in France, where the French Open dates to 1891.[16] Thus, Wimbledon, the US Open, the French Open, and the Australian Open (dating to 1905) became and have remained the most prestigious events in tennis.[12][17] Together these four events are called the Majors or Slams (a term borrowed from bridge rather than baseball).[18] The comprehensive rules promulgated in 1924 by the International Lawn Tennis Federation, now known as the International Tennis Federation, have remained largely stable in the ensuing eighty years, the one major change being the addition of the tie-break system designed by James Van Alen.[19] That same year, tennis withdrew from the Olympics after the 1924 Games but returned 60 years later as a 21-and-under demonstration event in 1984. This reinstatement was credited by the efforts by the then ITF President Philippe Chatrier, ITF General Secretary David Gray and ITF Vice President Pablo Llorens, and support from IOC President Juan Antonio Samaranch. The success of the event was overwhelming and the IOC decided to reintroduce tennis as a full medal sport at Seoul in 1988.
The Davis Cup, an annual competition between men's national teams, dates to 1900.[20] The analogous competition for women's national teams, the Fed Cup, was founded as the Federation Cup in 1963 to celebrate the 50th anniversary of the founding of the ITF also known as International Tennis Federation.[21]
In 1926, promoter C.C. Pyle established the first professional tennis tour with a group of American and French tennis players playing exhibition matches to paying audiences.[17][22] The most notable of these early professionals were the American Vinnie Richards and the Frenchwoman Suzanne Lenglen.[17][23] Once a player turned pro he or she could not compete in the major (amateur) tournaments.[17]
In 1968, commercial pressures and rumors of some amateurs taking money under the table led to the abandonment of this distinction, inaugurating the open era, in which all players could compete in all tournaments, and top players were able to make their living from tennis.[24] With the beginning of the open era, the establishment of an international professional tennis circuit, and revenues from the sale of television rights, tennis's popularity has spread worldwide, and the sport has shed its upper/middle-class English-speaking image[25] (although it is acknowledged that this stereotype still exists).[25][26][27]
In 1954, Van Alen founded the International Tennis Hall of Fame, a non-profit museum in Newport, Rhode Island.[28] The building contains a large collection of tennis memorabilia as well as a hall of fame honoring prominent members and tennis players from all over the world. Each year, a grass-court tournament and an induction ceremony honoring new Hall of Fame members are hosted on its grounds.

Equipment

Part of the appeal of tennis stems from the simplicity of equipment required for play. Beginners need only a racquet and balls.

Racquets

The components of a tennis racquet include a handle, known as the grip, connected to a neck which joins a roughly elliptical frame that holds a matrix of tightly pulled strings. For the first 100 years of the modern game, racquets were of wood and of standard size, and strings were of animal gut. Laminated wood construction yielded more strength in racquets used through most of the 20th century until first metal and then composites of carbon graphite, ceramics, and lighter metals such as titanium were introduced. These stronger materials enabled the production of oversized rackets that yielded yet more power. Meanwhile technology led to the use of synthetic strings that match the feel of gut yet with added durability.
Under modern rules of tennis, the racquet must adhere to the following guidelines;[29]
  • The hitting area, composed of the strings, must be flat and generally uniform.
  • The frame of the hitting area may not be more than 29 inches in length and 12.5 inches in width.
  • The entire racquet must be of a fixed shape, size, weight, and weight distribution. There may not be any energy source built into the racquet.
  • The racquet must not provide any kind of communication, instruction or advice to the player during the match.
The rules regarding racquets have changed over time, as material and engineering advances have been made. For example, the maximum length of the frame had been 32 inches until 1997, when it was shortened to 29 inches.[30]
A tennis racket.

Balls

Tennis balls are of hollow rubber with a felt coating. Traditionally white, the predominant color was gradually changed to Optic Yellow in the latter part of the 20th century to allow for improved visibility.
A Penn tennis ball.

Miscellaneous

Advanced players improve their performance through a number of accoutrements. Vibration dampers may be interlaced in the proximal part of the string array for improved feel. Racket handles may be customized with absorbent or rubber-like materials to improve the players' grip. Players often use sweat bands on their wrists to keep their hands dry as well. Finally, although the game can be played in a variety of shoes, specialized tennis shoes have wide, flat soles for stability and a built-up front structure to avoid excess wear.

Manner of play

Court

Main article: Tennis court
Tennis is played on a rectangular, flat surface, usually grass, clay, a hardcourt of concrete and/or asphalt and occasionally carpet (indoor). The court is 78 feet (23.77 m) long, and 27 feet (8.23 m) wide for singles matches and 36 ft (10.97 m) for doubles matches.[31] Additional clear space around the court is required in order for players to reach overrun balls. A net is stretched across the full width of the court, parallel with the baselines, dividing it into two equal ends. The net is 3 feet 6 inches (1.07 m) high at the posts and 3 feet (91.4 cm) high in the center.[31]
The modern tennis court owes its design to Major Walter Clopton Wingfield who, in 1873, patented a court much the same as the current one for his stické tennis (sphairistike). This template was modified in 1875 to the court design that exists today, with markings similar to Wingfield's version, but with the hourglass shape of his court changed to a rectangle.[32]
The dimensions of a tennis court

Lines

The lines that delineate the width of the court are called the baseline (farthest back) and the service line (middle of the court). The short mark in the center of each baseline is referred to as either the hash mark or the center mark. The outermost lines that make up the length are called the doubles sidelines. These are the boundaries used when doubles is being played. The lines to the inside of the doubles sidelines are the singles sidelines and are used as boundaries in singles play. The area between a doubles sideline and the nearest singles sideline is called the doubles alley, which is considered playable in doubles play. The line that runs across the center of a player's side of the court is called the service line because the serve must be delivered into the area between the service line and the net on the receiving side. Despite its name, this is not where a player legally stands when making a serve.[33] The line dividing the service line in two is called the center line or center service line. The boxes this center line creates are called the service boxes; depending on a player's position, he or she will have to hit the ball into one of these when serving.[34] A ball is out only if none of it has hit the line or the area inside the lines upon its first bounce. All the lines are required to be between 1 and 2 inches (51 mm) in width. The baseline can be up to 4 inches (100 mm) wide if so desired.[33]

Play of a single point

Main article: Point (tennis)
The players (or teams) start on opposite sides of the net. One player is designated the server, and the opposing player is the receiver. Service alternates game by game between the two players (or teams.) For each point, the server starts behind their baseline, between the center mark and the sideline. The receiver may start anywhere on their side of the net. When the receiver is ready, the server will serve, although the receiver must play to the pace of the server.
In a legal service, the ball travels past the net (without touching it) and into the diagonally opposite service box. If the ball hits the net but lands in the service box, this is a let or net service, which is void, and the server gets to retake that serve. The player can serve any number of let services in a point and they are always treated as voids and not as faults. A fault is a serve that falls long or wide of the service box, or does not clear the net. There is also a "foot fault", which occurs when a player's foot touches the baseline or an extension of the center mark[35] before the ball is hit. If the second service is also a fault, the server double faults, and the receiver wins the point. However, if the serve is in, it is considered a legal service.
A legal service starts a rally, in which the players alternate hitting the ball across the net. A legal return consists of the player or team hitting the ball before it has bounced twice or hit any fixtures except the net, provided that it still falls in the server's court. A player or team cannot hit the ball twice in a row. The ball must travel past the net into the other players' court. A ball that hits the net during a rally is still considered a legal return. The first player or team to fail to make a legal return loses the point.
Two players before a serve

Officials


In most professional play and some amateur competition, there is an officiating head judge or chair umpire (usually referred to as the umpire), who sits in a raised chair to one side of the court. The umpire has absolute authority to make factual determinations. The umpire may be assisted by line judges, who determine whether the ball has landed within the required part of the court and who also call foot faults. There also may be a net judge who determines whether the ball has touched the net during service. In some tournaments, certain line judges, those who would be calling the serve, are assisted by electronic sensors that beep when an out call would have been made. This was called "Cyclops;" however, since the introduction of Hawkeye technology, Cyclops is pretty much extinct now. In some professional tournaments, players are allowed to challenge a limited number of close calls by means of electronic review. The US Open, the Sony Ericsson Open in Key Biscayne, Florida, the US Open Series, and World Team Tennis started using a "challenge" system in 2006 and the Australian Open and Wimbledon introduced the system in 2007. This used the Hawk-Eye system and the rules were similar to those used in the NFL, a player may use unlimited challenges in a set, provided that he or she is not incorrect more than three times. In clay-court matches, such as at the French Open, a call may be questioned by reference to the mark left by the ball's impact on the court surface.
The referee, who is usually located off the court, is the final authority about tennis rules. When called to the court by a player or team captain, the referee may overrule the umpire's decision if the tennis rules were violated (question of law) but may not change the umpire's decision on a question of fact. If, however, the referee is on the court during play, the referee may overrule the umpire's decision (This would ONLY happen in Davis Cup or Fed Cup matches, not at the World Group level, when a chair umpire from a non-neutral country is in the chair).
Ball boys and girls may be employed to retrieve balls, pass them to the players, and hand players their towels. They have no adjudicative role. In rare events (e.g., if they are hurt or if they have caused a hindrance), the umpire may ask them for a statement of what actually happened. The umpire may consider their statements when making a decision. In some leagues, especially junior leagues, players make their own calls, trusting each other to be honest. This is the case for many school and university level matches. The referee or referee's assistant, however, can be called on court at a player's request, and the referee or assistant may change a player's call. In unofficiated matches, a ball is out only if the player entitled to make the call is sure that the ball is out.
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Tim Henman preparing to hit a serve. The left arm is extended, having just launched the ball into the air. The right arm will be raised up and forward at speed so that the racquet connects with the ball

Match play

A tennis match is intended to be continuous.[37] Because stamina is a relevant factor, arbitrary delays are not permitted. In most cases, service is required to occur no more than 20 seconds after the end of the previous point.[37] This is increased to 90 seconds when the players change ends (after every odd-numbered game), and a 2 minute break is permitted between sets.[37] Other than this, breaks are permitted only when forced by events beyond the players' control, such as rain, damaged footwear, damaged racquet, or the need to retrieve an errant ball. Should a player be determined to be stalling repeatedly, the chair umpire may initially give a warning followed by subsequent penalties of "point", "game", and default of the match for the player who is consistently taking longer than the allowed time limit.[38]
In the event of a rain delay, darkness or other external conditions halting play, the match is resumed at a later time, with the same score as at the time of the delay, and the players at the same end of the court when rain halted play, or at the same position (north or south) if play is resumed on a different court.
Balls wear out quickly in serious play and, therefore, in ATP and WTA tournaments, they are changed after every nine games with the first change occurring after only seven games, because the first set of balls is also used for the pre-match warm-up.[39] As a courtesy to the receiver, the server will often signal to the receiver before the first serve of the game in which new balls are used as a reminder that they are using new balls. However, in ITF tournaments like Fed Cup, the balls are changed in a 9–11 style. Continuity of the balls' condition is considered part of the game, so if a re-warm-up is required after an extended break in play (usually due to rain), then the re-warm-up is done using a separate set of balls, and use of the match balls is resumed only when play resumes.




Roger Federer preparing to hit a forehand. He is "loading" his body weight on his back (right) foot and coiling his shoulders with the help of his left hand. From this position, he will "uncoil" his body beginning with his legs, progressing to his hips and then on to his arms. This is how the "modern" forehand, utilizing the open stance, is executed.

A recent proposed rules change is to allow coaching on court during a match on a limited basis. This has been instituted in women's tennis for WTA Tour events from 2009 onwards.


Rafael Nadal performing a backhand volley

Theams of tennis players while playing tennis

















Motorcycle racing

 Motorcycle racing

Two motorcycles racing at Lydden
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Motorcycle racing (also called moto racing and bike racing) is a motorcycle sport of racing motorcycles. Major genres include road racing and off road racing, both either on circuits or open courses, and track racing. Other categories include hill climbs, drag racing and land speed record trials.
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Categories
The FIM classifies motorcycle racing in the following four main categories.[1] Each category has several sub categories.[2]
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Road racing

Road racing is the racing of motorcycles on tarmac. Races can take place either on purpose-built racing circuits or on closed public roads.


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Motorcycle Grand Prix

 

Grand Prix motorcycle racing refers to the premier category of motorcycle road racing. It is divided into three distinct classes:
  • 125 cc — Engines in this class are two-stroke. This class is also restricted by rider age, with an upper limit of 25 for newly signed riders and wild card entries and an absolute upper limit of 28 for all riders.
  • Moto2 — Introduced by Dorna Sports, the commercial rights holder of the competition, in 2010 as a 600 cc four-stroke class. Prior to that season, the intermediate class was 250 cc with two-stroke engines. Moto2 races in the 2010 season will allow both engine types; from 2011 on, only the four-stroke Moto2 machines will be allowed in this class.
  • MotoGP — 800 cc four-stroke.
Grand prix motorcycles are prototype machines not based on any production motorcycle.
MotoGP racing

 

 

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Superbike racing


Superbike racing is a category of motorcycle road racing that employs modified production motorcycles. Superbike racing motorcycles must have four stroke engines of between 800 cc and 1200 cc for twins, and between 750 cc and 1000 cc for four cylinder machines. The motorcycles must maintain the same profile as their roadgoing counterparts. The overall appearance, seen from the front, rear and sides, must correspond to that of the bike homologated for use on public roads.
Super bike racing



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Supersport racing


Supersport racing is another category of motorcycle road racing that employs modified production motorcycles. To be eligible for Supersport racing, a motorcycle must have a four-stroke engine of between 400 and 600 cc for four-cylinder machines, and between 600 and 750 cc for twins, and must satisfy the FIM homologation requirements. Supersport regulations are much tighter than Superbikes. Supersport machines must remain largely as standard, while engine tuning is possible but tightly regulated.
Super sport racing

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Endurance racing


Endurance racing is a category of motorcycle road racing which is meant to test the durability of equipment and endurance of the riders. Teams of multiple riders attempt to cover a large distance in a single event. Riders are given the ability to change during the race. Endurance races can be run either to cover a set distance in laps as quickly as possible, or to cover as much distance as possible over a preset amount of time.


Endurance racing






True road racing



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True road racing is run on tracks built from closed public and/or park roads and sometimes extra pieces of purpose built track. In the past true road racing was very commonplace but today few races have survived and even fewer have been added. Only one truly international championship exists at present by the name of "International Road Racing Championship" (IRRC). Most races are held within Europe. Ireland is probably the country with the most true road racing circuits still in use. The Isle of Man probably has the most tracks per inhabitant or surface area. Other countries where true road races are held are the Netherlands, Belgium, Germany, Great Britain (though due to law only outside England or in parks), the Czech Republic, New Zealand and Macau
Road racing on temporiary






Motocross


--> Motocross (or MX) is the direct equivalent of road racing, but off road, a number of bikes racing on a closed circuit. Motocross circuits are constructed on a variety of non-tarmac surfaces such as dirt, sand, mud, grass, etc., and tend to incorporate elevation changes either natural or artificial. Advances in motorcycle technology, especially suspension, have led to the predominance of circuits with added "jumps" on which bikes can get airborne. Motocross has another noticeable difference from road racing, in that starts are done en masse, with the riders alongside each other. Up to 40 riders race into the first corner, and sometimes there is a separate award for the first rider through (see holeshot). The winner is the first rider across the finish line, generally after a given amount of time or laps or a combination.
Motocross has a plethora of classes based upon machine displacement (ranging from 50cc 2-stroke youth machines up to 250cc 2-stroke and 450cc 4-stroke), age of competitor, ability of competitor, sidecars, quads/ATVs, and machine age (classic for pre 1965/67, Twinshock for bikes with two shock absorbers, etc).
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Supermoto


Supermoto is a racing category that is a crossover between road-racing and motocross. The motorcycles are mainly motocross types with road-racing tyres. The racetrack is a mixture of road and dirt courses (in different proportions) and can take place either on closed circuits or in temporary venues (such as urban locations).
The riding style on the tarmac section is noticeably different from other forms of tarmac-based racing, with a different line in corners, sliding of the back wheel around the corner, and using the leg straight out to corner (as opposed to the noticeable touching of the bent knee to the tarmac of road racers).


Super motor rider

Drag Racing / Sprints

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Drag racing and/or sprints is a racing venue where two participants line up at a dragstrip with a signaled starting line. Upon the starting signal, the riders accelerate down a straight, quarter-mile long paved track where their elapsed time and terminal speed are recorded. The rider to reach the finish line first is the winner. This can occur upon purpose built venues (e.g., Santa Pod), temporary venues (e.g., runways or drives of country houses). In addition to "regular" motorcycles, top fuel motorcycles also compete in this category.
Drag racing

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Hill Climb

In hill climbing, a single rider climbs or tries to climb a road going up a hill in the fastest time and/or the furthest up the hill before ceasing forward motion. Tarmac events are typically on closed public roads and private roads. The same concept is also used off-tarmac, usually on steeper hills.

Landspeed Racing

In Landspeed motorcycle racing, the racer is trying to beat the fastest speed ever achieved by that style of motorcycle and type of engine for a timed mile. The pre-eminent event for motorcycle LSR is the International Motorcycle Speed Trials by BUB, held on the Bonneville Salt Flats annually (near Labor Day.) Motorcycles are classified based on body style, i.e. how much streamlining is incorporated. They are further classified based on engine size in cubic centimeters (cc's) and based on fuel type (gasoline versus any modified fuel.)

Vintage Motorcycle Racing

In vintage racing riders race classic motorcycles that are no longer competitive with the latest production motorcycles. Classes are organized by production period and engine displacement. There are vintage events for almost every type of racing listed above, vintage motocross and road racing are especially popular. Equipment is limited to that available for the production period, although modern safety equipment and tires are permitted. Most vintage production periods are from the 1970s and before, but now 1980s motorcycles are being allowed into some events[citation needed]. Generally a motorcycle must be at least 25 years old to be considered vintage.
The sanctioning body for most US vintage racing is the American Motorcyclist Association. The main organizations that sponsor vintage racing are the American Historic Racing Motorcycle Association (AHRMA), and WERA Motorcycle Roadracing, which has several vintage classes along with modern racers. Of historical importance is the United States Classic Racing Association (USCRA) one of the oldest vintage racing clubs in the US.

 
Theams of Motor bikes


Motorcycle racing

Motorcycle racing

Motorcycle racing

Motorcycle racing

Motorcycle racing

 Motorcycle racing

Motorcycle racing

Motorcycle racing

Motorcycle racing

Motorcycle racing

Motorcycle racing

Motorcycle racing

Motorcycle racing

Motorcycle racing

Motorcycle racing

Motorcycle racing

Motorcycle racing




You knaow that the motobike is the one thing that all the young guys like it to drive.
motor bike is now used as the riding vehichal.