With your hands next to your hips, support your weight with your arms as you shift off the edge of the box ( A).
Sit on the edge of a box or bench, with your legs outstretched. With your hands next to your hips, support your weight with your arms as you shift off the edge of the box ( A). Flex at the elbows to lower your body until you feel a stretch across your chest ( B). Straighten your arms explosively to push back up. Elevate your feet to increase the difficulty.