Every time I see a video of someone doing push-ups, there's always someone in the comments saying about how the form is bad. I was always told my form was bad, but was never told what to do to improve it. Are push-ups just some Emperor's New Clothes kind of thing where nobody knows how to do one, but everyone needs to pretend to know so they don't seem like un-fit idiots?
Fingers forward, hands not to far apart and arms/elows bend in line/ almost parallel with your body (not completely though). Rest of your body from back to ankles is a straight plank line, without your butt sagging or being in the air. Engage core muscles (almost as if you're trying to pee or take a shit) to keep the plank. Go down until your head or chest almost grazes the floor, then up again.
At least that's what I was told when I was able to work out in the past. Could be incorrect or outdated
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Yeah, the diamond push up is a classic variation.
Also can raise your feet and/or add weights to make them more difficult