Lie face down on your stomach with arms and legs extended. Keep your neck relaxed and in line with your spine.
Keeping your arms and legs straight (but not locked) and torso stationary, simultaneously lift your arms and legs up toward the ceiling to form an elongated "U" shape with your body. Your back should be arched with arms and legs lifted several inches off the floor. Keep your core pulled in and your neck in line with your body, so you're looking down and not up.