Why does sitting at a desk all day make us so tired? Do you feel fatigued, sore or head achy after a long day's work behind a computer? We explain the physical mechanics and pitfalls of an immobile and faulty posture at work. What is it? How unpleasant is it to feel physically run down or achy after spending a day at work being immobile most of the time. As a result symptoms often are chronic lower back pain (dull ache, soreness, tightness, stiffness, etc..), tension in betwe