Strokes........( Swimming )

Four main strokes are used in competition and recreational swimming: the front crawl (freestyle), breaststroke, backstroke, and butterfly.

In non-competitive swimming, there are some additional swimming strokes, including the sidestroke and survival backstroke. The sidestroke, toward the end of the 19th century, changed this pattern by raising one arm above the water first, then the other, and then each in turn.

It is still used in lifesaving and recreational swimming. Survival backstroke is a modified form of backstroke designed to conserve energy and allow a swimmer to remain afloat for extended periods.

It is generally performed while lying on the back, using a slow, controlled leg kick and alternating or simultaneous arm movements, with the face kept above the water. The stroke is primarily used in lifesaving, survival swimming and situations where conserving energy in the water is important.

Other strokes exist for particular reasons, such as training, school lessons, and rescue, and it is often possible to change strokes to avoid using parts of the body, either to separate specific body parts, such as swimming with only arms or legs to exercise them harder, or for amputees or those affected by paralysis.