back extension on exercise ball

How to do it

1. 1Place the stability ball on the ground and lie face down on top of it, with your hips resting on the ball and your feet against a wall or other stable surface.
2. 2Position your hands behind your head or crossed over your chest.
3. 3Engage your core and slowly lift your upper body off the ball, extending your back until your body forms a straight line from your head to your heels.
4. 4Pause for a moment at the top, then slowly lower your upper body back down to the starting position.
5. 5Repeat for the desired number of repetitions.