Push Up Rocker

Place your hands on the floor facing forward so they line up directly under your shoulders. Elevate your body up so your bodyweight is distributed between your feet and your hands. Contract your abdominals and keep your body completely straight from head to heels. Bend your elbows and lower your chest to the floor. Once your elbows bend slightly beyond 90 degrees, rock your elbows back to the floor so you assume a plank position. During this movement your feet will slide back a few inches to coincide with the movement. Maintaining straight posture, slide your feet back to the starting position and lift your elbows off the floor so you are applying your bodyweight back on your hands in the bottom push up position. Push off the floor and extend your arms so that your body returns to starting position without locking out your elbows at the top and repeat.