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Old 01-16-2013, 04:43 PM   #145
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Join Date: Jun 2009
Location: such united many state
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I personally don't know.

When I do P90X, when I can't get my chin above the bar anymore, I switch to chair-assisted. I choose how much I apply pressure to my leg based upon how difficult it feels. When I feel completely burned even with leg assist, I am usually done.
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