HOW: Start this exercise on your side in which you want to strengthen. From this position, push your forearm and knee into the floor as you elevate yourself. As you elevate also thrust your hips forward so that your knees, hips, and shoulders are in a straight line. Stay strong in the shoulder blade in this position.
FEEL: The entire side on the floor from the outer part of the bottom glute to the core up to the shoulder in contact with the floor.
COMPENSATION: Not keeping yourself in a straight line, not extending your hip fully, letting the scapula sag.