Primary Muscle Groups: Upper Abs, Lower Abs, Lats (back)
Secondary Muscle Groups: Side Shoulders, Front Shoulders, Rear Shoulders, Transverse Abdominis, Quads

Lie on your stomach with toes tucked in and palms by your shoulders. Lift your entire torso off the ground. Lower your entire torso into an elbow plank. Return to the high plank. (One rep completed)