HOW: Begin the exercise by laying on your side, the side closest to the ground will be doing most of the work. Lift up into a full side plank with your feet stacked or one foot in front of the other, keeping your body in one straight line from your heels to your hips to your shoulders.
FEEL: You will feel your shoulder, hip, and core working - specifically the side facing the floor.
COMPENSATION: Avoid allowing your shoulder blade to sag back. Avoid allowing your hips to dip towards the floor when holding at the top