HOW:Begin in the quadruped position with your back flat, knees on the ground underneath the hips, and your hands underneath your shoulders. From here, keep your elbows straight as you bring your shoulder blades back. Once they are as far back as you can go, push into the ground rotating them forward.
FEEL: You should feel your shoulder muscles working, especially underneath your shoulder blades in your armpits.
COMPENSATION: Keep your neck in line with your spine, don’t drop it. Keep your elbows straight and back flat.