Be sure to maintain proper posture throughout the entire movement to prevent unneeded stress. Keep your shoulder blades retracted slightly; maintain good stability in your core during the entire movement and keep your spine in natural alignment.
Kneel down on the floor slowly and lean your hips securely on the stability ball.
Once securely positioned on the ball, grasp medicine ball in both hands and hold your arms overhead.
Begin the exercise by first tightening your glutes, keeping your chin tucked for proper spine alignment and extend your back as illustrated below.
Lower slowly back into the starting position, making sure to keep the stability ball still the entire movement.
Swiss Ball Back Extension, Stability Ball Back Extension, Back Extensions on Ball, Back Extensions on Stability Ball.