| 摘要 |
A short motion swim fin used as training device for the improvement of the fast flutter kick motions of speed swimming and as such uses a flat flexible plate which is rigid across its base, and inner rubber sheath surrounding the plate and an outer sheath which varies in length depending upon the rigidity desired by thereby varying a projecting portion of the plate which contact the water. The plate functions as a lever on the underside of the foot to stretch the arch of the foot on every downward kick, as well as to strengthen the fast twitch leg muscles associated with a strong flutter kick.
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