Welcome to ultimate training to better mark the disc. Starfish planks are excellent for functional strengthening after coming back from injuries involving the rotator cuff, shoulder, elbows, neck and back, hip and groin strains. First, engage your inner core by making yourself skinner at the waist line, then with your core engaged move into the plank position. Then bring the right hand and foot out to the right and back again, repeat this ten times. Then repeat it on the left side and do a total of three sets of ten for each side.