Dolphin kick

It is frequently used by competitive swimmers during entry and turns, and as part of the Butterfly stroke.

It is typically used in competitive swimming immediately after a swimmer enters the water or after turns.

[1][2] The stroke is useful in competitive swimming for its physical properties: it reduces drag while providing a significant amount of thrust, with comparatively low physical exertion.

This kick should occur after the swimmer leaves the wall and before the hands turn inward at the widest part of the stroke.

Additional dolphin kicks during the swim are prohibited and can result in disqualification.