If your back feels tight, stiff or painful, you’ve got a lot of company. An estimated 90 percent of us will suffer from back pain at some point. For some people, back pain or discomfort is a constant or chronic condition. It’s not surprising. Our increasingly sedentary lifestyles predispose us to back problems. More than ever, we’re sitting: at desks, in front of computers and in our cars, and for more and more hours of the day. Pilates, a form exercise that’s been growing in popularity for the last 50 years, turns out to be an ideal way to reverse the damage caused by modern life and technology—and to keep our bodies pain-free.