Exercise Advice: Sit on an exercise ball with your back upright and your feet firmly planted on the ground (see illustration). Grab a dumbbell in one hand, holding it in a shoulder press position. Next, simply press the dumbbell from that position straight up toward the ceiling. Return to the start position and repeat for the desired number of repetitions and then repeat with the opposite arm. Be sure to keep your back straight and upright throughout the entire exercise!