Most back troubles are minor problems caused by weak muscles, particularly the abdominals, which provide most of the spine’s support. To strengthen them, Dr. Shelekov recommends walking, in conjunction with curl-ups: Lie on your back with your knees bent and your hands on your thighs. Keeping your lower back pressed to the ground, lift your head, neck and shoulders. Hold for a count of two; return. Start with five per day, working up to three sets of ten. As your abdominals become stronger, try the curl-ups with your hands across your chest.