When guys who lift weights do the front-overhead press, their shoulder muscles fire in a way that uses the back part of the side shoulder muscle more during the lifting part of the move.

If you're a guy who lifts weights, doing overhead presses from the front vs. the back lights up different parts of your shoulder and triceps muscles as you lower the weight — meaning the path the bar takes changes which muscle fibers get used most.

If you're a guy who lifts weights, doing a front shoulder press lights up the back part of your shoulder higher up and your chest lower down compared to doing a back shoulder press — probably because your joints and muscle fibers move differently in each version.

If you're a guy who lifts weights, doing the back-overhead press might fire up your rear shoulder and triceps muscles more than the front version when you're lowering the weight.

The more you lean back when doing pressing exercises, the more the front of your shoulder muscles do the work instead of your chest — and when you're standing straight up, your front shoulders are working the hardest.

If you're a male bodybuilder, doing the back barbell shoulder press lights up your side shoulder muscles more than the front version — both when lifting and lowering the bar, and the difference is really big.