Flutter kick
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The flutter kick is a kicking movement used in both swimming and calisthenics.
In swimming (either front crawl or backstroke), the legs are extended straight out in line with the body and then moved up and down, the one leg kicking downwards as the other leg moves up again.
In calisthenics, one lies on one's back, with one's hands under the hips, and the chin tucked to the chest. The legs are then raised 6 inches off the ground, and then alternately moved up and down, two sets of leg movements counting as one count of the exercise. This exercise is often used as an incentive tool in the military.
