Lay on your back with hands by your side, knees bent and feet flat on the floor (under the knees)

Press your feet into the floor as you tighten your butt and abs, and lift your hips up to create a straight line from knees to shoulders

While holding the position in good form (tighten the core, trying to pull your bell button back toward the spine) raise left feet off the floor such that there is a straight line from your left feet to shoulder

Hold for a second and drop your left foot down and raise the right feet and repeat the movement

Lower your hips back down to the floor