The move>Start on your hands and knees, shoulders and wrists in line, hips and knees in line. Pull your belly in and bring your neck and spine in line. Keeping arms straight, inhale as you gently arch your back and tip tailbone up [A]. Exhale as you round your spine, tuck your tailbone under and pull your navel to spine, chin to chest [B]. Repeat 10–15 times.