Lie in the neutral position, with your arms in the air, palms facing each other. Breathe in, then exhale, drawing your ribcage down and bringing one arm over your head while keeping the other arm in the air. Avoid flaring your ribs and keep your back in the neutral position and your shoulders down.. This exercise can be done either with one arm at a time or by drawing circles with both arms. Try adding a leg lift to make this more challenging, but do not lose the quality of your movement.