HOW: Get set-up in a standing position with your hands by your side and arms straight. While maintaining arm position, slowly make big backward followed by forward circles with your shoulders and shoulder blades.
FEEL: This should feel like nice shoulder and shoulder blade movement. Think about making smooth, big circles in both directions. You should feel your shoulder blade muscles controlling the movement.
COMPENSATION: Keep the rest of your body including your head and neck still as you perform this exercise.