Mention ergonomics and most people think of posture — specifically, sitting at work, which a recent survey found 86 percent of U.S. workers must do. Between commuting, desk jobs and lounging at home, Americans sit an average of 7.7 hours a day. The computer age has brought us keyboard trays and wrist rests for carpal tunnel syndrome. Now, it has brought us standing and treadmill desks to combat the “sitting disease” of sedentary lifestyles.