If you're a healthy guy doing dumbbell shoulder presses, sitting down might work your rear shoulder muscles a bit more than standing up—about 15% more, according to muscle activity readings.

If you're a healthy guy doing seated shoulder presses with heavy weights, using dumbbells probably works your front shoulder muscles a bit more than using a barbell.

When healthy guys do shoulder presses, standing with dumbbells makes their shoulder muscles work harder (based on electrical activity), even though they can lift heavier weights when sitting with a barbell.

If you're doing shoulder presses, your rear shoulder muscles are working a lot more than if you're doing bench presses or dumbbell flies — like over three times more, according to this claim.

If you're a guy who lifts weights, the shoulder press works your front shoulder muscle more than bench presses, flys, or lateral raises when doing a typical workout.

If you're a guy who lifts weights, doing shoulder presses wakes up your rear shoulder muscles way more than bench presses or flys—even though shoulder presses aren't meant just for that area.