Start in a kneeling position with your hands under your shoulders, and knees under your hips.
Place a wobble cushion under the knee on your affected leg.
Bring your other leg forwards and place your foot flat on the floor.
Use your hands on your thigh for balance.
Straighten your body up, and then try to remove the support of your hands.
Rotate your body one way and then the other, keeping your posture upright.
Maintain your balance.