Sculpt the muscles in the back of your upper arms by doing repetitions of this triceps press using a weight bar. Performing this triceps exercise on a stability ball also works your core muscles.
Assume start position as shown by laying on ball.
Make sure your head, neck, and shoulders are supported.
Keep your upper arms still and bend at your elbows to bring dumbbells behind head.
Straighten arms out and contract triceps muscle.