Start: Attach a stirrup handle to the high cable and stand sideways to the weight stack. Grab the handle with your inside hand and pull it down so your palm is in line with your head and your elbow points straight down.
Finish: Crunch your rib cage sideways toward your hip bone on the same side as the arm holding the pulley, keeping your hand in the same position relative to your head. Pause, then slowly straighten your back. Finish the repetitions on that side, then repeat with your opposite side toward the weight stack.