Want to make the most of hour cable crunch? Think about fully stretching the abdominal muscle and then fully contracting the muscle. Set your hips in position, we do not want to contract the hip flexor muscles too much during this movement. Choose a handle that you can comfortable keep in position with your arms approximately at 90 degrees. When set in position you will contract your abs to bring your elbows beside your knees, then return to position going into a slight thoracic extension, while still maintaining the same hip position.