有氧运动-第1页

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xcyd

0操作1 ^#

( 220-age ) x 60% ~ 80% should all be fine

below it, has not effect on your heart,

above it, it is too tense and not considered areobic

xcyd

0操作2 ^#

this site might be more precise

[URL=http://www.stevenscreek.com/goodies/hr.shtml]http://www.stevenscreek.com/goodies/hr.shtml[/URL]

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