HOW: Start by lying face down with your arms directly in front of you and your legs straight down. Lift your arms and legs up towards the ceiling at the same time while keeping your elbows and knees straight. Lift as high as you can and slowly come back down.
FEEL: You should feel the muscles in your low back, glutes, and shoulder blades working.
COMPENSATION: Don’t bend your elbows or knees when lifting up. Keep your neck in a neutral position, don’t look up.