Chester Andrew Jastremski (born January 12, 1941) is an American former competition swimmer, Olympic medalist, and former world record-holder.
Jastremski attended Indiana University, where he swam for Doc Counsilman's Indiana Hoosiers swimming and diving team. He and Counsilman invented the whip kick to replace the frog kick previously used in the breaststroke. The whip kick minimized drag and accentuated Jastremski's very powerful shoulders and upper arms. Over the years, the original whip kick (done from the knee to feet) morphed into the breaststroke kick that uses the entire leg.