You've heard it all before—exercise is good for your health. Exercise helps lower your risk of diabetes, heart disease, and other serious diseases. Not only is exercise good, new studies show that sitting all day is bad for your health. In fact, people who sit many hours a day have twice the rate of heart disease as people who don't sit for long hours. Plus, sitters are more likely to die of heart attacks, even if they exercise regularly.
Over the course of a long weekend, a nimble crew of furniture assemblers transformed our old-fashioned office into modern computer workstations. A week later my office mate started having headaches and pain in her hands and lower arms. We tried to figure out why she was having problems. We ruled...