The Pull Through
When the upper arm is about opposite the shoulder in its pull through the water the legs should be separated for the leg stroke, and they should be in position for giving the snappy kick when the hand leaves the water and the kick should be completed and legs straightened out before the upper arm is ready to begin the next stroke. The legs are opened up and brought together simultaneously, the upper leg being brought forward, the knee slightly bent, and the foot kept in its ordinary position and not allowed to hang free, the lower leg being bent backward, with the heel toward the thigh and swinging on a hinge (so to speak), so that there is little resistance. Both feet should be kept near to the surface of the water, except at the end of the stroke, when the right foot dips to come just under the left.