HOW: begin in a full side plank with one foot in front of the other, keeping your body in one straight line from your heels to your hips to your shoulders. With the top arm reach down and across towards the arm on the floor, followed by rotate this arm open towards the ceiling. Move controlled with this exercise, maximize the range of motion you go through.
REGRESSION: If too difficult perform this exercise on an elevated surface or with your knees on the floor. Both of these variations will decrease the demand of this exercise.
FEEL: You will feel your core working, specifically the core facing the floor (Obliques). The shoulder of the forearm on the ground will be working during this exercise.
COMPENSATIONS: Avoid allowing your shoulder blade to sag back.