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Treading water
Water treading is an aspect of swimming that involves a swimmer staying in a vertical position in the water while keeping his or her head above the surface of the water. Treading water provides the swimmer an opportunity to keep the head from becoming submerged while not providing sufficient directional thrust to overcome inertia and propel the swimmer in any specific direction.
==Methods==
Any sort of movement that allows the swimmer to do this can be classified as treading water, but it is more efficient to move the arms and legs in a specific fashion.
Drowning non-swimmers often splash and kick in an effort to stay above the surface but their lack of technique along with shortness of breath and the panic factor make this a very ineffective method of treading water. They will usually tire quickly and not be able to stay above the surface very long.
More experienced swimmers often find their own method of staying above the surface. These techniques often involve sculling, flutter kick, and other unofficial techniques of staying above the surface.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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