Start in a full arm plank on your hands, with your wrists and elbows under your shoulders and your feet hip width apart or slightly wider. Keep your body in a straight line, with your tailbone tucked in. Lower your right elbow to the mat and then your left, coming into an elbow plank. Put your right hand on the mat and straighten your right elbow. Do the same on the left to return to a full plank. Bring your right knee towards your left elbow and then the left knee towards the right elbow. That’s one rep.

Repeat 12x (switch sides in the next round).