The final exercise in this circuit will stretch your lower back while challenging abdominal muscles.
How to do it: Lie faceup with your arms extended straight out from your shoulders, palms facing down. Bend your knees and hips 90 degrees so you're in table top position. Brace your abs in tight, and keeping both shoulder blades pressed into the ground, slowly lower your legs (maintaining 90-degree angle, knees should be touching) to the right without touching the ground (go as far to the side as you can without lifting your shoulders).
Draw your abs in tighter as you slowly lift your legs back up to center, tucking knees into chest and lifting your tailbone off the floor. Lower your hips down and repeat to the other side. Continue alternating sides for 1 full minute.
If you can't lift your hips during the center tuck, just draw your knees in as close to your chest as possible.