bridge position with calves on ball, lift hips to align knees and trunk, alternately lift each leg.
Sit with calf on the swiss ball and hands under the shoulder. Lift the buttocks off the floor, so that knees, buttocks and trunk are in straight line. Lift one leg off the ball and lower it back on the ball. repeat by alternatingly lifting legs off the ball.
Nothing here is a prescription. Your physiotherapist decides which of these are yours, and when.
