Bent-over reverse fly
The bent-over fly works the muscles in your rear deltoids.
How to do a bent-over fly:
Your feet will be just under your hips with a slight bend at the knees. Hinge forward from your hips, keeping your back flat (shoulders pulled back) and core braced. Open your arms straight out to the sides, squeezing your shoulder blades together, then bring them back down with control.