送交者: HunHunSheng 于 2005-8-09, 12:13:24:
回答: swim is the best thing. if you can, join the YMCA 由 xj 于 2005-8-09, 10:19:27:
Because you don't need bone to support your body in water as much as on lands, so bones do not get enoughexercise.
加跟贴
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