Position yourself on all fours with hands directly beneath your shoulders and knees directly beneath your hips with your back straight. Use your abdominal muscles to push your back towards the ceiling, arching it like a cat. You should notice your head will point down towards the floor. Next, drop your back so that your lower back extends. Your head should raise when doing this. Make sure to keep your elbows straight the entire time, the only movement should be in your spine. Repeat this 12-15 times.