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. Additional stability can also be achieved by pressing feet into a wall.
Once securely positioned on the ball, extend your arms as illustrated.
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.
Back Extensions on Ball, Lower Back Extension Exercises, Back Extension Exercise Ball, Swiss Ball Back Extensions.