並列摘要
Hsu (1976) expressed that it is necessary are for good swimmer to have velocity and durance. But it is also important to have good distance and speed of jumping. The paper is to introduce the mechanical elements of jumping coming from Chiu (2002), and discuss the advantage and disadvantage of backstroke jumping in terms of mechanical elements. It is concluded it was better to bend one’s back to do the hole entering while starting. But when the coaches teach the technique, they shall command swimmers to do weight training because it needs strong strength and flexibility of whole body to match.