
seated rotation of thoracolumbar spine while maintaining balance on unstable surface with controlled twisting movement
Sit on the Swiss ball, with feet touches the floor and hips-knees at 90-90 degrees and arms by the side. With maintaing the balance, rotate the back to one side as looking behind. Untwist back to starting position and repeat.
Nothing here is a prescription. Your physiotherapist decides which of these are yours, and when.