Start: Put an ankle strap around one ankle and attach it to the low pulley. Stand sideways with your working foot closest to the weight stack and about a foot away from it. Hold on to the tower for balance as you lift your leg for a few inches forward. Your nonworking knee should be slightly bent, and your shoulders and hips should be square and facing forward.
Finish: Pull your working leg across the midline of your body until it passes your other leg. Pause, then slowly return to the starting position. Finish the set with that leg, then repeat with the other.