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The dolphin kick is used in the butterfly stroke. Many people fear the butterfly, but once they try the stroke they realize that they can do it, and are good at it! A good way to think of this kick is by picturing dolphins swimming--they don't call it the dolphin kick for nothing! Another way is to picture how a mermaid would swim with her giant tail. The kick consists of a continuous undulation of the legs that begins in the hips. Once the kick is learned, the arms can be incorporated into the full stroke.