Alternating Dumbbell Rotational Press on Stability Ball Exercise
1. Begin lying with your upper back on the stability ball, with your legs bent use your feet for support on the floor, and activating your core for balance.
2. While grasping a dumbbell in each hand, press one dumbbell above your chest and rotate 90-degrees while the other rests on the chest in the down position.
3. Return the first dumbbell to the down position, rotating the weight back and press the other above your chest.