ABSTRACT
Dynamics of swimming is fluid mechanics that acts on a swimmer and the water of the circumference of the body. Counsilman (1968) proposed S-shaped pull swimming style is suitable for the front crawl in 1968. This S-shaped pull uses the resultant force of the lift and drag as an impellent. Lately, Sanders (1997) stated that competitive swimmers seem to use a drag type stroke rather than S-shaped pull stroke in his experimental research. Moreover, the author (Ito & Okuno, 2003) introduced I-shaped pull stroke obtained larger thrust force than S-shaped.
