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In a 25 meter or yard pool, each swimmer swims two lengths for the 200 relay, four lengths for the 400 relay, and eight lengths for the 800 relay. Many petition pools in the United States have a length of 50 meters and a width of 25 yards, allowing both short course and long course races to be held.

In the United States and the United Kingdom munities petitive swimming leagues for children and young people 18 years of age and younger, made up of individual swim teams, which may range in size from a few dozen swimmers to several hundred swimmers. These leagues for the most part adhere to recognized swimming rules, swim the standard strokes, but swim shorter lengths as events in swim meets.

These leagues are usually active in the warmer months, and are not directly associated with a national or world swim organization. However, some swimmers who begin petitive swimming experience on such a local swim team go on to join a nationally-governed team, on their path to an Olympic berth later.

Top american swimmers include Michael Phelps, Cullen Jones, Katie Hoff, Jayme Cramer, Ryan Lochte, Aaron Piersol, Natalie Coughlin, Gary Hall Jr., Ian Crocker, and Brendon Hansen. Top Australian swimmers include Ian Thorpe, Grant Hacket and Libby Lenton.

The mon reason for swimming is recreation, where the swimmer enters the water merely for enjoyment. Recreational swimming is considered by many a good way to relax, as well as providing a good 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 with an underwater arm recovery. Breaststroke, side stroke, and dog paddle, are the mon 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.

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 pools, where the water is calm. Therefore freestyle which does not work as well in rough water is suitable.

Venues for recreational swimming are swimming pools, beaches, lakes, swimming holes, creeks, rivers, and sometimes canals. 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.

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