STARTING POSITION:
Put a ankle strap to a low cable pulley and hook it to the right ankle. Select the appropriate resistance in the weight stack. Find something stable to grab it with your left hand. The weight stack should be behind you. Your right hip should start extended. Bend your knees slightly. The cable should have tension before start the exercise. Contract your pelvic floor and core.
MOVEMENT:
In a fast movement, raise your knee until your thigh is parallel to the floor. Make sure you only move your right leg. Return to the starting postion with a smooth movement, preventing moving weights from touching the rest of the stack. Repeat the movement for the specified amount of repetitions and then switch sides and repeat with the other leg.
TIPS: Make sure you don't move any other part of your body, paying special attention to your abdominal muscles. Focus on slow and controlled movement