HOW: Start by facing a wall. Stand as close as you can to it with your feet up against it spread about shoulder width and your toes slightly facing outward. Raise your arms up overhead. Use your core and hip muscles to pull your hips straight down as you lower your body into a squat bending your knees while keeping your arms up overhead. Go as low as you can, then push into the ground with your heels and return to the starting position.
FEEL: You should feel your lower body muscles working as you squat down. You should also feel your core and shoulder muscles working trying to stabilize your upper body.
COMPENSATION: Keep your arms overhead, don’t drop them down. Stay as close to the wall as you can.