If yours is a sitting down job, then you may know the value of good quality office chair. But to avoid long-term problems, you’ll need to make sure it’s set so you can move around as much as possible. To maximize your comfort, you need to use all possible features and degrees of freedom that your chair can offer, says Andreas Stephan, a specialist in workplace health at German accident insurer VBG. A common mistake that office workers make is to lock the backrest of their chair, typically by pushing a handle beneath the seat. Instead, you should be leaving this unlocked so the back can rock ba…