Execution: Very similar to the Knee-to-Chest; lie face down on the floor; place your hand just underneath your shoulders and press up so that you are holding yourself up on your hands and your toes; lift your right leg and drive it out to the side towards your elbow; as you drive your leg into your elbow, crunch your upper body to the right side to increase the contraction of your obliques; return to the start position before completing another rep.