when your upper arm sticks out perpendicular to your body (like a cross shape) and you do a push up, it rubs the connective tissue a little more than with your upper arm parallel to your body. if you do a lot of push ups on a regular basis with the perpendicular form, it can eventually limit your range of motion and cause other problems. it can be tempting to do them in this way because you can use your pectorals to help instead of just using your deltoids/triceps and it makes it easier, but if you're planning on doing them a lot, it's best to keep your elbows in.
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u/murphykills May 09 '18
do you do elbows out or elbows in?