If you've recently given birth, it's a good idea to check with your doctor before starting a fitness routine. By fitness routine, I don't mean all the lifting, carrying and stroller-pushing that may be a new part of your life--perhaps making you feel as if you've run a marathon every day. The American College of Obstetricians and Gynecologists says that it is generally all right to gradually resume your pre-pregnancy fitness routine based on your physical capability. It might be helpful to visit a certified personal trainer who specializes in postnatal exercise and who can tailor a fitness program to your needs.

This exercise is best done by lying on your back with your knees bent and your feet flat on the floor. Breathe deeply and pull your stomach in as you exhale. As you contract your abdominal muscles, gently tilt the pelvic bones on either side of your navel toward your upper body and hold there for a count of five. This should help alleviate any backache as well as tone your stomach muscles. Build up gradually, doing a few at a time at regular intervals.

Another exercise is the cat back stretch. Begin on your hands and knees with your knees under your hips and hands directly beneath your shoulders. Keep your back straight. Arch your spine toward the ceiling, tucking your tailbone under and relaxing your head and neck. Return to the starting position; then arch your spine slightly, head up. Repeat the exercise four to six times.