你当过海军陆战队还不如练三项。


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送交者: HHS 于 2010-06-21, 11:26:29:

回答: 跑步距离一次增加太多确实鲁莽 由 虎子 于 2010-06-21, 10:32:41:

For cardiovascular exercise, you can exercise for long time. But since duration is done on three legs (swim, biking and running) and two of them are exercise easy on your feet and knees



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