Lie prone on the stability ball with lower abs, hips, and upper thighs resting against the ball and shoulders higher than hips. Place feet on the ground and wedged against an immovable surface. With dumbbells in hand and hanging straight in front of your chest, elbows slightly bent, bring the weights up, driving the elbows towards the ceiling but maintaining the same slight bend in the elbows throughout the entire motion. Engage the upper back muscles, exhaling as you lift. Maintain engagement of the glutes, low back, and abdominal muscles. Return dumbbells to starting position, inhaling as you bring the weights back down.