Swimming : Swim 

Swimming is, generally, the methods by which humans (or other animals) move themselves through water without the aid of implements.

Swimming is a popular recreational activity, particularly in hot countries and in areas with natural watercourses, and a basic safety skill for those participating in on-water activities. Swimming pools are popular summer venues around the world, as are beaches, lakes, swimming holes[?] and sometimes canals (although the last mentioned may be dirty and/or dangerous). For changing clothes see beach.

Swimming is generally held to be a good form of exercise. It is especially recommended to sufferers of arthritis and other osteopathic conditions, as the body is supported by the water and less stress is therefore placed on joints and bones. (more needs to be written on this. Link: http://content.health.msn.com/content/article/1676.52654 )

History

Competition

The laws of competitive swimming place certain restrictions on the action used by the swimmer, depending on the event:

• Freestyle events place no restrictions on what action the competitors use. In practice, all freestyle events are swum using front crawl. Events are held at distances from 50 metres to 1500 metres.
• Butterfly[?] events require that the swimmer's actions retain bilateral symmetry (the left side of the body has to do the same as the right). It is swum over 50, 100 and 200 metres. Butterfly, as it is typically performed, is the most strenuous stroke to maintain and few recreational swimmers can perform the stroke at all.
• Breaststroke[?], from which the butterfly stroke evolved, places the additional restriction that the swimmer's hands must be pushed forward together from the breast and that the elbows must remain under the water. It is the slowest stroke, and swum over 50, 100 and 200 metres.
• Backstroke[?] places no symmetry restrictions, but swimmers must lay on their back at all times (except when turning) to perform the stroke. Backstroke is performed, in essence, as an inversion of the crawl - competitors swing their arms back over their shoulder, alternately, and pull through under the water to provide motive power, with a scissor kick. It is also swum over 50, 100 and 200 metres.

Full rules are on the FINA (Federation Internationale de la Natation) website at http://www.fina.org/swimrules.html.

Additionally, there are "medley" events where swimmers successively perform the backstroke, breaststroke, butterfly, and then freestyle.

Recreational swimmers also use several strokes not used in competition - sidestroke, which as the name suggests is performed on the swimmer's side, dog paddle, where the head is kept above the water and the arms paddle underneath, and survival backstroke, a stroke performed on the back, but using underwater recovery and a breaststroke-style kick.

Competitive swimming has traditionally been dominated by the United States, but recently that dominance has been challenged by Australia, where swimming is a hugely popular recreational activity, and participant and spectator sport. The success of Australian swimmers like Ian Thorpe and Kieren Perkins is reminiscent of Australia's previous golden age of swimming in the 1950s and 1960s, which saw the emergence of swimmers such as Shane Gould[?] and Dawn Fraser[?].

There are also long-distance open-water swimming races (a 5 kilometre open-water event became part of the Olympic program in 2000), and some hardy individuals attempt very long-distance swims for record attempts - a typical target for such swimmers is the English Channel, but it is by no means the longest such event.

Swimming is also a crucial part of the sports of surf lifesaving and triathlon.

External link: http://www.fina.org/ -- Federation Internationale de la Natation, competitive swimming's governing body.

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