The heart rate monitor could be handy
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送交者: daye 于 2007-10-08, 21:27:41:
回答: 马拉松的有无特别训练自己对极限的判断力?还是一味的说“要坚持坚持” 由 Enlighten 于 2007-10-08, 09:32:43:
If you see the number > 200, then you know for sure that
it's time to slow down.
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