However there is no proof that one kick is better than another. However, the six beat kick might help lift the sprinter higher in the water, while the two beat kick retains the stabilizing effect while conserving the energy of the long distance swimmer. The butterfly kick is also known as the dolphin kick since it simulates the movement of a dolphin tail. The thrust, as mentioned previously, is derived from the sculling motion of the feet through the water. The butterfly kick also has a stabilizing effect by aiding in the timing of the stroke.
Most people find the butterfly the most difficult to perform.
However, with the proper stroke mechanics and timing, one should find that the butterfly is a very simple stroke to perform. Since the butterfly kick mimics the movements of a dolphins tail, comparisons between man and dolphin have been made. The studies show a remarkable similarity between champion butterfly swimmers and captive dolphins. The differences lie in the duration of the up and down strokes of the kick. The dolphin has a much faster up-stroke as the muscles have developed for this feat.