Lie on your back with your legs in tabletop position. Engage your deep abs.
Exhale and lift your upper back off the floor, and straighten your legs to a 45-degree angle (you can bend your knees if this is too challenging).
Reach your arms toward your feet, about two inches off the floor.
Pump your arms up and down with a small range of motion, keeping your elbows straight. Inhale for five arm pumps, and exhale for five pumps. That's one set or cycle.