· Attach a stirrup bar to a low cable pulley. · Stand of the side of the weight stack with your legs shoulder width apart and your knees slightly bent and your abs drawn in. · Grasp the stirrup in one hand with an palms facing up. · Lower the stirrup to the top of your thighs. · Keeping your elbows still, curl the stirrup up towards your chest. · Slowly lower the stirrup to the starting position.