200 to 50, Shorter = Faster

This swimming workout features a series of swims that get shorter as the workout progresses. The workout challenges swimmers to swim faster as the swimming distances get shorter. Swimmers can vary this same workout by mixing in different strokes, changing the amount of rest between swims, and by changing the amount of rest between each set of swims.

http://swimming.about.com/od/aboutsswimworkouts/qt/swim200_50swim.htm

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