The English are considered the first modern society to develop swimming as a sport. By 1837 swimming competitions were being held in London's six artificial pools, these competitions were organized by the National Swimming Society in England. As the sport grew in popularity many more swimming pools were built, and when a new governing body, the Amateur Swimming Association of Great Britain, was organized in 1880, it numbered more than 300 member clubs.
In 1896, swimming became an Olympic sport for men with the 100 meters and 1500 meters freestyle competitions held in open water. Soon after, as swimming gained popularity, more freestyle events were included, followed by the backstroke, butterfly, breaststroke, and lastly, the individual medley.
For a variety of reasons, women were excluded from swimming in the first several Olympic Games. In 1896 and again in 1906, women could not participate because the developer of the modern games, Baron Pierre de Coubertin, held firmly to the assumption, common in the Victorian era, that women were too frail to engage in competitive sports. It was only at the 1912 Games when women's swimming made its debut at the prompting of the group that later became known as the International Olympic Committee.
The first modern Olympic Games had only four swimming events, three of them freestyle. The second Olympics in Paris in 1900 included three unusual swimming events. One used an obstacle course; another was a test of underwater swimming endurance; the third was a 4,000-metre event, the longest competitive swimming event ever. None of the three was ever used in the Olympics again.
From this humble beginning with four swimming events, the Olympics have now developed to 32 swimming races, 16 for men and 16 for women. The Special Olympics includes competitive swimming for people with disabilities and has 22 events for men and 22 for women.
Recreational swimming
The most common purpose for swimming is recreation. Recreational swimming is a good way to relax, while enjoying a full-body workout. Several swimming styles are suitable for recreational swimming; most recreational swimmers prefer a style that keeps their head out of the water and has an underwater arm recovery. Breaststroke, side stroke, head up front crawl and dog paddle are the most common strokes utilized in recreational swimming, but the out-of-water arm recovery of freestyle or butterfly gives rise to better exploitation of the difference in resistance between air and water.
The butterfly stroke, which consists of out-of-water recovery with even symmetry in body movements, is most suited to rough water swimming. For example, in a record-setting example of endurance swimming, Vicki Keith crossed the rough waters of Lake Ontario using butterfly. Most recreational swimming takes place in swimming pools, and calm natural waters (sea, lakes, rivers), therefore front crawl is suitable.
Occupational swimming
Some occupations require the workers to swim. For example, abalone divers or pearl divers swim and dive to obtain an economic benefit, as do spear fishermen.
Swimming is used to rescue other swimmers in distress. In the USA, most cities and states have trained lifeguards, such as the Los Angeles City Lifeguards, deployed at pools and beaches. There are a number of specialized swimming styles especially for rescue purposes (see List of swimming styles). Such techniques are studied by lifeguards or members of the Coast Guard. The training for these techniques has also evolved into competitions such as surf lifesaving.
Swimming is also used in marine biology to observe plants and animals in their natural habitat. Other sciences use swimming, for example Konrad Lorenz swam with geese as part of his studies of animal behavior.
Swimming also has military purposes. Military swimming is usually done by Special Forces, such as Navy SEALS. Swimming is used to approach a location, gather intelligence, sabotage or combat, and to depart a location. This may also include airborne insertion into water or exiting a submarine while it is submerged. Due to regular exposure to large bodies of water, all recruits in the United States Navy, Marine Corps, and Coast Guard are required to complete basic swimming or water survival training.
Swimming is also a professional sport. Companies such as Speedo, TYR Sports, Arena and Nike sponsor swimmers who are at the international level. Cash awards are also given at many of the major competitions for breaking records.
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