Exercise Ball One-Arm Dumbbell Extension Video Exercise Guide

The exercise ball one-arm dumbbell extension is the same as a one-arm seated dumbbell extension, but you're seated on an exercise ball. The ball makes your core work harder to maintain stability.

1. Set up by sitting on an exercise ball with your feet firmly placed on the floor holding a dumbbell above your head with your left hand, thumb facing your head (palm forward).
2. Use your other arm to help stabilize the body on the ball.
3. Tense the midsection and straighten the lower back. This is the starting position for the exercise.
4. Keeping your eyes facing forwards and elbow locked in position, slowly lower the dumbbell behind your head as far as possible.
5. Pause, and then raise the dumbbell back to the starting position without locking your elbow out.
6. Lower and repeat for desired reps, and then repeat the same process for your right arm.