Start by lying flat on your back. Gently press your spine into the ground and lift your legs off the ground, bending them so you form a 90-degree angle with your shins parallel to the ground and your thighs perpendicular. Make sure your knees are stacked over your hips and your toes are pointed.
Bend your right leg in toward your chest and grab the top of your shin as you extend your left leg out in front of you, hovering it a few inches above the ground. Keep your chin off your chest and your shoulders pressed down.
Switch legs, bending your left leg in toward your chest as your right leg extends straight out.