The reason for these problems is the differences in heights, in quality of sight, in tolerance levels and in preferences in left or right-handedness. Positions that cause no problem with one person will limit the productivity of someone else. Muscles alternately tighten and relax which keeps the blood circulating and removing toxins that build up. Muscles that are tight all the time are unable to receive fresh oxygen. Pain is a warning signal and a way of protecting the muscles.
Pauses are necessary for well-being and work efficiency.
The spine is literally the supporting structure of the body. It has changed little since we first started walking upright. The S-curve of the spine helps us cope with different kinds of load. In the past the chair has been expected to provide both sitting and working comfort for employees who work at fixed height surfaces. Unnecessary pressure is put on the back of the legs from having to adjust the chair higher than is natural.