2. Chair width and depth - The office chairs should be wide enough to support users of any size. Usually, office chair width should vary between 17 to 20 inches. The chair depth is area from front of seat to back.

The office chair depth should be big enough for user to sit back against backrest with 2 to 4 inches left between knees and seat of chair.

3. Armrests - Adjustable armrests of office chairs allow users' elbows, arms and shoulders to be rested comfortably.

4. Backrests - The backrest of office chairs should vary between 12 to 19 inches. Again, like all parts of office chair, backrest should also be adjustable enough to move forward and backward as user desires. A small cushion can be placed against small of back to provide a natural curve to spine.

5. Swivel - Work in office requires moving around desk area - moving from computer to file cabinet or reaching out for phone. The office chair should be able to rotate to enable user to do all these things without putting body through difficult contortions.

Even if you are not able to get "perfect office chair", you can always use Alexander Technique. Alexander Technique is gaining popularity nowadays. It helps to make proper use of body and enhances coordination and efficiency of movement.

The Alexander Technique is used in sports, dancing and acting but it can also be used to improve everyday activities such as walking or sitting.

The technique reeducates body and mind and shows how head, neck and torso are used. The idea is to hold head in such a way that length of spine and neck are not shortened or curved.

No amount of ergonomically designed office chair can force body into correct posture. It is up to body and mind to sit in a healthy manner so as not to injure any body part.

The mind has to be aware and not preoccupied. Every couple of minutes, mind should check posture and body has to cooperate. Over a period, correct posture comes automatically without too much effort.