Lying on your back, place your feet on the wall in front of you with a 90-degree bend in your knees and at your waist. Stretch resistance band around your back, hold each end in each hand, and extend arms to the ceiling. Lift your hips off the ground, then lift your shoulders off the ground leaving only your lower back to support yourself. Now reach one arm across your body over the opposite arm as you crunch diagonally. Release and return to starting position.
