With the increasing stress of modern life, the acceleration of the pace of life, the heavy load of studying, and overtime with work projects, people have no choice but to complete these tasks in front of their computer at their desks.  When you are working hard trying to finish a test, or when you are working on a project that is due the next day, your concentration keeps you in the same position for many hours on end.  When you start moving away from your post, you will find that your neck is stiff and painful, your back hurts, and you even have a slight headache.