Lower back flexibility exercise

Lie on your back with your knees bent and your feet flat on the floor (A). Tighten the muscles in your belly so that your lower back pulls up, away from the floor (B). Hold for five seconds and then relax. Flatten your back, pulling your bellybutton toward the floor (C). Hold for five seconds and then relax. Repeat. Start with five repetitions a day and slowly work up to 30.