Sit on the ball with your knees hip width apart and hands resting in your lap.
Activate your deep stabilisers and make sure you are sitting in the neutral spine position.
Slowly transfer your weight from side to side, keeping your hips and shoulders in line so that movement occurs at your hips and not at your lower back.
As you transfer your weight take some of your weight off the opposite heel as if you were preparing to lift the heel.
