- Start in the high plank position: set hands under and slightly outside of the shoulders, with the feet approximately shoulder width apart. - Maintain tight core cylinder. Do not let hips shift side-to-side. - Drive one hand up to opposite side shoulder. Hold in this position for a full 1-2 seconds. Do not shrug. - Resist rotation. Maintain core tension. Keep hips level. - Lower hand to ground to return to starting position.