That’s over 27 hours per week and more than 1,350 hours per year (or a staggering 7 weeks per year) sitting down in your office chair! Yep, now would be a good to time to have a kit kat and stretch your legs….. A single chair that fits all people is as challenging to design as it is to find one answer to fit all questions. As long as chairs continue to reflect the human beings who use them, variety will be a consideration. The old adage, “People come in all shapes and sizes,” is a tired cliché to a lot of people. To those who design and manufacture office chairs, it’s a daily reminder of the difficult task they face: making chairs that fit a tremendously varied population. Walk through the offices of just about any company and you’ll see people of vastly different sizes and proportions. Often taken for granted, better chair design is the key to minimizing if not preventing injuries and pain associated with office occupations, and we don’t just mean adjustable feature. Proper office chair design is about correct fit. Correct fit meaning that the chair that allows the user to comfortably rest his or her feet on the floor, with the thighs fully supported and approximately parallel to the floor. The user’s back should be comfortably supported, and the angle formed by the thighs and the torso should be between roughly 90 and 105 degrees. Tilting back should be easy, but not too easy. And the chair should permit frequent posture changes—an essential element of comfortable sitting.