1. Lie on your back on the floor and bend your knees so your feet rest on the floor close to your butt.
2. Brace your abs and drive your heels into the floor to raise your hips into the air.
3. From there, walk your feet out in a V shape, taking small steps with your heels forward and away from the midline of your body. Keep your hips up.
4. Continue until your legs are extended and then walk them back in. That’s one rep.