HOW: Start in the plank position with your elbow straight and your legs straight with your toes pushing into the ground. Bring one foot as far front as your can up on the side of that arm. When the foot is as high as you can place it on the ground, drop your hips slightly and look up. Alternate this motion with each leg.
FEEL: You should feel a stretch in your hip of the leg that is forward and even in the front portion of the hip that is behind you.
COMPENSATION: Keep your back flat, don’t arch it as you bring your leg up.