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There are a number of specialized swimming styles specially for rescue purposes see List of swimming styles. Such techniques are studied by lifeguards or members of the Coast Guard.

The training of these techniques has also evolved petitions such as surf lifesaving. Swimming is studied to improve the performances petitive swimmers.

Swimming is also used in marine biology to observe plants and animals in their natural habitat. Other sciences may also use swimming, for example Konrad Lorenz swam with geese as part of his studies of animal behavior.

Swimming also has military purposes. A swimmer in the water or under the water can be difficult to detect, especially at night.

Military swimming is usually done by Special forces, such as Navy SEALS. Swimming is used to approach a location, gather intelligence, sabotage bat, and to depart a location.

This may also include airborne insertion into water or leaving a submerged submarine through a hatch or the torpedo tubes. Special equipment and techniques are also used to engage hostiles in and under water.

Swimming has more recently e a professional sport as panies such as Speedo and Tyr Sports, Inc. sponsor swimmers just as Nike sponsors basketball players.

Cash awards are also given at many of the petitions for breaking records. Swimming is a good form of exercise.

Because the density of the human body is approximately similar to that of water, the body is supported by the water and less stress is therefore placed on joints and bones. Therefore, swimming is frequently used as an exercise in rehabilitation after injuries or for those with disabilities.

Resistance swimming is one form of swimming exercise. It is done either for training purposes, to hold the swimmer in place for stroke analysis, or to enable swimming in a confined space for athletic or therapeutic reasons.

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