One-Arm Standing Overhead Press
"This is the safest version of the overhead press because it reduces the weight used, keeps your elbows in — which is easier on your rotator cuff — and also strengthens the abs as you stand locked in place," says Ballantyne.
The Setup: Hold a dumbbell at shoulder level with your palm turned in. Place your other hand on your abs to ensure they are braced. Your feet should be shoulder-width apart and knees slightly bent.
How to Do It: Keeping your abs braced, press the dumbbell overhead. Slowly lower back down.