Friday, April 22, 2011

Monday, April 4, 2011

Running race

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 about four and a half million years ago, 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.

Sports car racing

Sports car racing is a form of circuit auto racing with automobiles that have two seats and enclosed wheels. They may be purpose-built or related to road-going sports cars.
A kind of hybrid between the purism of open-wheelers and the familiarity of touring car racing, this style of racing is often associated with the annual Le Mans 24 Hours endurance race. First run in 1923, it is one of the oldest motor races still in existence. Other classic but now defunct sports car races include the Italian classics, the Targa Florio (1906–1977) and Mille Miglia (1927–1957), and the Mexican Carrera Panamericana. Most top class sports car races emphasise endurance (races are typically anywhere from 2.5 to 24 hours in length), reliability and strategy over pure speed. Longer races usually involve complex pit strategy and regular driver changes—sports car racing is seen more as a team sport than a gladiatorial individual sport, and team managers like John Wyer, Tom Walkinshaw, driver-turned-constructor Henri Pescarolo, Peter Sauber and Reinhold Joest have become almost as famous as many of their drivers.
The prestige of Porsche, BMW, Ferrari, Lotus, Maserati, Alfa Romeo, Lancia, Mercedes-Benz, Jaguar, and Aston Martin derives in part from success in sports car racing and the World Sportscar Championship. Road cars sold by these manufacturers have in many cases been very similar to the cars that were raced, both in engineering and styling. It is this close association with the 'exotic' nature of the cars that serves as a useful distinction between sports car racing and touring cars.

Bicycle racing

Bicycle racing is a competition sport in which various types of bicycles are used. There are several categories of bicycle racing including road bicycle racing, cyclo-cross, mountain bike racing, track cycling, BMX, bike trials, and cycle speedway. Bicycle racing is recognised as an Olympic sport. The Union Cycliste Internationale is the world governing body for cycling and international competitive cycling events.
All bicycle races involve diamond frame bicycles of two triangles, generally composed of various steel alloys (with Cr–Mo), aluminum, or carbon fiber. An alternative is the recumbent, a bicycle on which the rider sits back with the legs horizontal. This puts the body in a position where there is less wind drag. Proponents claim it provides more comfortable riding, with no weight on the wrists. The recumbent is a more aerodynamic design of bicycle, and world speed records were set with them.
Bicycle races are popular all over the world, especially in Europe. The countries most devoted to bicycle racing are Italy, Spain, Belgium, Germany, Denmark, France, the Netherlands, and Switzerland, although the United States has international standing, as do Australia, Luxemburg, and the UK.

Hockey

Games played with curved sticks and a ball have been found throughout history and the world. There are 4000-year-old drawings from Egypt. Hurling dates to before 1272 BC in Ireland, and there is a depiction from ca. 600 BC in Ancient Greece where the game may have been called kerētízein or kerhtízein (κερητίζειν) because it was played with a horn (kéras, κέρας) or horn-like stick. In Inner Mongolia, China, the Daur people have been playing beikou, a game similar to modern field hockey, for about 1,000 years. There were hockey-like games throughout Europe during the Middle Agesand the word "hockey" was recorded in 1363 when Edward III of England issued the proclamation: "[m]oreover we ordain that you prohibit under penalty of imprisonment all and sundry from such stone, wood and iron throwing; handball, football, or hockey; coursing and cock-fighting, or other such idle games.

Long Tennis

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 the United Kingdom 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". After its creation, lawn tennis spread throughout the upper-class English-speaking population before spreading around the world.
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 opportunity to challenge, but 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.

Basketball

Basketball is a team sport in which two teams of five players try to score points by throwing or "shooting" a ball through the top of a basketball hoop while following a set of rules. Basketball is one of the most popular and widely viewed sports in the world.
A regulation basketball hoop consists of a rim 18 inches (45.7 cm) in diameter and 10 feet (3.05 m) high mounted to a backboard. A team can score a field goal by shooting the ball through the hoop during regular play. A field goal scores two points for the shooting team if a player is touching or closer to the hoop than the three-point line, and three points (a "3 pointer") if the player is "outside" the three-point line. The team with more points at the end of the game wins, but additional time (overtime) may be issued when the game ends with a tie. The ball can be advanced on the court by bouncing it while walking or running (dribbling) or passing it to a teammate. It is a violation (traveling) to walk with the ball, carry it, or to double dribble (to hold the ball and then resume dribbling).
Various violations are generally called "fouls". Disruptive physical contact (a personal foul) is penalized, and a free throw is usually awarded to an offensive player if he is fouled while shooting the ball. A technical foul may also be issued when certain infractions occur, most commonly for unsportsmanlike conduct on the part of a player or coach. A technical foul gives the opposing team a free throw.
Basketball has evolved many commonly used techniques of shooting, passing, and dribbling, as well as specialized player positions and offensive and defensive structures (player positioning) and techniques. Typically, the tallest members of a team will play "center", "small forward", or "power forward" positions, while shorter players or those who possess the best ball handling skills and speed play "point guard" or "shooting guard".
While competitive basketball is carefully regulated, numerous variations of basketball have developed for casual play. Competitive basketball is primarily an indoor sport played on carefully marked and maintained basketball courts, but less regulated variations are often played outdoors in both inner city and rural areas.