Overhead Extension
Works: triceps, shoulders, upper back
You should be holding the dumbbell with both hands, with your feet hip-width apart and your knees bent slightly.
Raise the dumbbell vertically above your head. Tend to your wrists so that they are straight. To perform this exercise, lower the dumbbell behind your head by bending your elbows. Keep the tops of your arms close to your head and your elbows pointing up.
Straighten your arms up, and then do this 8–12 times.
