types of strokes 
Four basic categories are recognized by the International Amateur Swimming Federation (FINA): the breaststroke, the butterfly, the backstroke and freestyle (the crawl).
Stroke characterized by a series of simultaneous arm movements (toward the front, toward the outside and toward the rear) that are synchronized with the beating of the legs.
Movement for making a half turn; the swimmer touches the wall with both hands, pivots, then pushes from the wall with the feet.
Movement in which the swimmer bends the legs and then stretches them simultaneously toward the outside; it is more powerful than other leg kicks.