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Re:How to hack your body: Can you get fit in six minutes a week by fizx on Wednesday July 01, 2009 @12:43PM (#682918)
Every day, I bike from downtown SF (work) to the top of Russian Hill (home) on a fixed gear bike (~1 mile, ~500ft elevation gain).

About once every month or two, I bike 50-150 miles in a day, and don't find it problematic.

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