Be carefull about your knees
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送交者: PenName 于 2009-01-10, 13:58:41:
回答: 今早光脚在跑步机上慢速跑了跑, 感觉很好. 由 湘女 于 2009-01-10, 11:11:30:
It is Ok if you do this when you are in your 20's or even 30's. Otherwise, save your knees so you can walk at old age. :-)
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