Stand with your feet together, hands behind your head. Lower your right leg into a side lunge, bending your right knee and keeping your left leg straight. Push through your right heel and stand back up as you bend your right knee and cross it in front of your body without touching the floor, turning your right heel up towards the ceiling. While your right leg is up, do a side crunch, lowering your left shoulder down towards your left hip. Lower your leg and alternate sides.