1. Setup in a supine position with your legs in a 90/90 position (90 degree bend at the hips and knees) and your arms reaching towards the ceiling while pushing a physioball into your knees.
2. Extend the opposite arm and leg simultaneously as you exhale and press into the physioball with the non working arm and leg to stabilize the ball.
3. Return back to the starting position and repeat on the opposite side.
4. Repeat for the desired number of total repetitions.