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Old 01-19-2013, 04:31 AM   #2
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Join Date: Aug 2010
Location: North East, England.
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Default Re: running vs circuit training vs skipping

Your body does adapt, that's how your capacity increases.

There's a lot of ground reaction force (Newton's 3rd law and all that) involved in overground running, so I don't like to do it frequently tbh.
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