1. Place each foot inside a TRX strap so that the TRX hangs vertically.
2. Start in a push-up position with your hands directly beneath your shoulders and your feet shoulder-width apart.
3. Without moving your torso, bring one knee toward your chest, flexing at the hip.
4. Return your leg to the starting position while simultaneously movsliding your opposite knee toward your chest.
5. Continue alternating to complete the set.
Be sure to: Keep your stomach tight.
You should feel it: Working your shoulders and torso.