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If you spend long hours at your computer working or playing, you may experience certain discomforts. By simple adjustments they can be reduced or completely eliminated. Sitting is one of the most structurally taxing "activities" for your neck and back. Again, you will produce more if you break at least once an hour. By doing the following exercises, you'll prevent unneeded tension and pain. This e-book created by a few years research on the matter, I was a computer technician with IBM. knowing all of these issues was part of my job, well since I was suffering I’ve got curious and researched the matter in hand very well. I hope this will also help you in the future since we all have to use a computer in some capacity. Good luck and good health you.