The flutter kick is a kicking motion used in both swimming and gymnastics.
Video Flutter kick
Swimming
In stroke pools such as front crawling or backstroke, the main goal of a flutter kick is not propulsion but keeps the feet fixed above and in the upper body shadow and helps the body rotate for arm strokes. The legs extend straight backwards in line with the body. They move up and down, one leg kicked down (relatively ahead of the swimmer's body) as the other leg moves up. Knees slightly bent to facilitate kicking action, but not too much to minimize the obstacles created by the thighs as they move out of the shadow of the swimmer's body. Similarly, the toes pointed to minimize drag.
An integral part of the kick is flexing the ankle; it is an ankle flexing that allows the legs to give a boost. Downward moving legs give a boost. Not true to do a flutter kick with straight legs completely.
Scuba diving
Most of the scuba diving training organizations are agnostic for kicking techniques, and thus most of the underwater diver utilizes the surface swim kick to vibrate. However, since divers use swimfins, propulsion occurs almost entirely from kicks. Divers who use the Doing It Right approach and many other cave and wreck divers use a modified flutter or frog kick, performed entirely with knees bent, pushing water up and back of the diver to avoid agitation of sediment at the bottom.
Maps Flutter kick
Gymnastics
The gymnastics version of the flutter kick is often used as an intensive training tool in the military. They help develop hip flexors, abdominal muscles and leg muscles. Flutter kick is a four count practice. The starting position is lying on your back with your legs and head about 6 inches (15 cm) from the ground. Hands are under the buttocks to support the lower back. Count one: lift your left foot to a 45-degree angle, keep your right leg stationary. Calculate two: lift the right foot from the ground to a 45 degree angle while, at the same time, move your left foot to the starting position. Counts three and four are repetitions of the same movement. The feet should be locked, with the toes pointing away from the body.
References
Source of the article : Wikipedia
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