Twenty years ago I began swimming for exercise. I couldn't run anymore; my knees hurt too much. Though I never took swimming lessons, I cobbled together a passable crawl stroke from the informal and haphazard instruction I received as a kid. The other day in the pool, however, I realized that I've had an impressive swimming teacher recently. You've probably heard of him: Michael Phelps, American swimming phenom and winner of 8 gold medals in last summer's Olympic games.…
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