This exercise is great at building trans abdominal pressure! Make sure to keep your spine imprinted into the floor and core engaged. – Start by coming into the classic dead bug position with arms up straight and legs up at right angles – Starting at level one, lower one leg at a time down to a box for the reduced range below your feet and back up – This same motion can be done without the box by simply touching your foot down to the ground. – Once you have mastered that you can move onto using your arms as well by lowering your opposite arm to leg to the ground and back up