Lifting your arms out to the side or slightly backward, especially with your palms turned down, works your side shoulder muscles the most — this move might be the best way to build stronger shoulders.

Rotating your shoulders outward when doing overhead presses makes the front shoulder muscle work harder than the side one.

Lying down or tilted chest fly exercises, like incline dumbbell flys, really fire up your front shoulder muscles more than other moves — so they might be your best bet if you're trying to build stronger front shoulders.

Doing pull-ups, especially regular ones and inverted rows with straps, really lights up the back part of your shoulder muscles — so these moves might be great for working your rear shoulders without weights.

When you lift your arm out to the side, the middle part of your shoulder muscle works best at the start, but the front part takes over more when your arm goes way up past shoulder height.

If you're a guy who lifts weights, doing lateral raises gives your rear shoulder muscle the biggest workout compared to shoulder presses, bench presses, or dumbbell flies when using the same level of effort.