Stand in the power stance facing away from the wall with the ball held in front of you at waist height.
Commence the movement by rotating to one side and releasing the ball with enough force to rebound back at the same height.
Catch the ball on the rebound and use the motion to rotate your torso around to rebound the ball off the wall on the opposite side of your body.
Start slowly for the first few throws to ensure proper technique and then accelerate the movement keeping control of the ball and rotating through your hips, knees and trunk.