The central nervous system is composed of the brain and spinal cord. The spinal cord not only conducts signals and information between the brain and the body but controls the body’s reflexes. When you touch a hot pan, for instance, or trip over a rock, it is the spinal cord that pulls your hand away and keeps you from falling. Nerves conduct information about all kinds of things in your body, including pain, hunger, digestion, balance, and movement. When your body—especially your spine—is suffering from

Chairs may be Changing the Shape of Your Back To keep you upright while sitting, your body relies on an engaged core. Your abdominal muscles work with your back muscles to keep you centered and balanced, to keep your arms working and your head on straight. In short, sitting can be a low impact activity. But man, keeping your muscles constantly engaged means you don’t relax, and isn’t relaxation the reason chairs were invented in the first place? The problem is that few of the