Start: Attach a stirrup handle to the low pulley. Grab the handle with your nondominant hand and stand facing the weight stack, about a foot in front of it. Your feet should be parallel and about hip-width apart. Keep your shoulders back.
Finish: Step back with your dominant leg and lower your body until that knee almost touches the floor and the top of your other thigh is parallel to the floor. Return to the starting position. Finish the set, then switch legs and repeat.