HOW: Begin by lying face down on the ground. Bend one knee and bring it out to the side. Place your hands by your side with your elbows bent. From here, use only your arms to push your back up into extension and back down from the prescribed amount of reps.
FEEL: You should feel a stretch in your hip and low back muscles working.
COMPENSATION: Don’t engage your back muscles as you lift up, use only your arms to push yourself up. Keep your lower body still.