This is because your arms are providing forward momentum in addition to your legs, so the kick doesn't need to be as strong. The small kick is performed while you are making the keyhole shape with your arms.However, both kicks are not exactly the same - there is one small kick and one big kick. You should kick twice for each stroke of the arms in butterfly stroke.With the dolphin kick, both legs move simultaneously, and should be pressed together to avoid a loss of water pressure.Imagine kicking your legs like a dolphin (or a mermaid!) would kick its tail underwater. The dolphin kick is the name given to the dolphin-like kick of the legs used in butterfly stroke. Also, make sure the distance between your arms as you enter the water is no greater than shoulder width apart as this will greatly decrease entry drag allowing you to cut through the water more efficiently. Your palms should be facing outwards so your thumbs enter the water first, not your pinkies. Next, sweep both arms out of the water simultaneously and throw them forwards into the starting position. A good way to ensure that you have done this part of the stroke successfully is to drag your thumbs on your thighs as you are finishing the stroke. Essentially your hands must reach your thighs. The last part of the butterfly arm movement is the recovery which is where your hands must be positioned as they are in motion while finishing your pull and are getting ready to begin the subsequent stroke.
The pull is the wide part of the keyhole at the top, while the push is the narrow part of the keyhole at the bottom. A good way to remember the pull and push sequence is to imagine making the shape of a large keyhole with your hands underwater.This is the fastest part of the arm movement and provides the momentum necessary to complete the release. At the end of the pull, begin pushing your palms backwards through the water, along your sides and past your hips.Remember to keep your elbows higher than your hands. Starting with your arms extended above your head (shoulder width apart), pull your hands towards your body in a semicircular motion, palms facing outwards.The arm movement in butterfly stroke can be broken down into three parts: the pull, the push and the recovery.
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