OK so the knuckle is referring to the part where your finger meets your hand, where the bone bulges out a bit from the back of the hand.
But when doing knuckle push-ups, should you really be doing the push-ups on only your (inner two) knuckles, or should you be doing them on your closed fist (like using your knuckle and top section of the finger, if I'm not being too confusing)?
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