Here is a checklist of factors that will keep you comfortable while working those long, grueling hours at thecomputer.

1. Head: It should be directly over your shoulders without straining forward to peer at the computer screen or pulling backward in a pathetic attempt to avoid looking at it.
2. Neck: It should be relaxed. If you feel neck strain it is a pretty good sign that you are doing something wrong.
3. Back: The chair should support the natural contours of the back.
4. Elbows: Upper arms on your side (don't reach forward), elbows at about a 90-degree angle and hopefully, supported by armrests.
5. Wrists: Think neutral, Neither flexed up nor down but more as an extension of the forearm.
6. Chair seat: Slightly sloped forward to relieve the pressure spot at the front of the chair on the underside of the thighs. Seat height adjusted so that your hips are at 90 degrees or slightly higher.
7. Feet: Firmly plant them on the floor (or a small foot rest if you need it) and make sure you maintain a right angle at the knees. Don't cross your knees. Knees and feet at 90 degree angles.  And you should have some weightbearing through your feet--they should not be floating.
8. Computer screen: Center of screen slightly below eye level.
9. Computer keyboard: Should feel most comfortable positioned slightly below elbow level, so that elbow maintains 90-degree angle and the fingers can drop down to the keys.

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