Set the pulley on a cable machine at shin level and put an ankle strap on the end of the cable. Place an upright bench about three feet in front of the machine, facing away from it. Attach the ankle strap to your left ankle and sit on the bench. From a bent knee position, extend your leg up.

Strap an ankle cuff that is tethered to the cable stack machine. Stand or be seated facing away from the cable stack. Kick until the knee is completely extended. From there, bring the leg back to 90 degrees of flexion.