Today more than ever we work sitting, if not the whole day yes a good part of it. If we calculated the number of hours we spent sitting, we would surely pay more attention to the chair we used to work. Put a soft cushion on the seat, made of breathable fabric if possible. You will be surprised what a simple cushion can do for your comfort. Use chairs with arms: when you choose comfy office chair (if they give you a choice …: S) try to have arms. If you have them, place them at the correct height: when supporting the arm, your shoulder should be relaxed and the elbow should rotate at an approximate 90º angle.
Not only the height of comfy office chair, but a fundamental aspect is that the backrest is placed where you naturally have your back when you are sitting, and not far from it. It is a very common mistake, since it seems that if we are more lying down we will be more comfortable, and the reality is that in the end we do not support the back and work bent.
Because a ‘static’ chair, even if it is precious, is extremely uncomfortable to work with, because while we work we make small movements continuously and the mobility of the comfy office chair makes them easier and, consequently, it gets us we lose less and we force less the body.