Come into a side plank on your right side, with your feet stacked one on top of the other and your weight on your right elbow with your fingers reaching away from your body, palm down.
Place your left arm behind your head, and inhale to prepare.
Exhale and pull your navel to your spine to engage your deep abs, and rotate your left ribcage toward the floor. Stay there for a second, and deepen your abdominal connection by pulling your navel in toward your spine even more.
Return to starting position. This counts as one rep.