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Originally Posted by TRIANGLEFROMGAURD Please stop doing knuckle push ups they serve no purpose and only increase your chance at injury. Switch to diamonds better for upper pec or, chair push ups good for core and lower pec. | Now that depends on the softness of the material you're exercising on,doesn't it? I do all my pecs, arms, back, ab exercises and stretches on a 1cm thick yoga mat... I do the knuckle PU's on that, and it feels just like doing palm PU's on a warm wooden floor 
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