Sit on the ball with feet hip width apart.
Both arms are raised above your head with your elbows bent.
Both hands hold the resistance band which is attached behind you and above the level of your head.
Bend forwards at the hips keeping your spine in neutral and shoulder blades stable against your ribs.
In a controlled manner return to neutral position and then arch backwards with your thoracic spine, again keeping your low back stable.
To progress, add some rotation with the motion of the thoracic spine, so that one shoulder moves backwards in relation to the other shoulder.
