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Why are the knuckle push-ups made with vertical position of the hands, aren't they emulating punches (which in most cases are taught horizontal)? - Quora
How to Do Knuckle Pushups: 13 Steps (with Pictures) - wikiHow
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Knuckle Push-Ups: Benefits, Muscles Used, and More - Inspire US
Street Fitness - *Vitali-Klitschko* Knuckle push-ups Another variation is to perform pushups on the knuckles of the fist, rather than with palms of the hands on the floor. This method is also