Good posture is the key to comfort and health in your computer work. Check your posture using the list below.

Sit up straight, thighs fully supported by the seat.
Center your body in front of the keyboard and monitor.
Place your feet firmly on the floor or on a footrest.
Relax your shoulders and keep your elbows close to the body.
Keep forearms and wrists in a straight line (neutral position). Make sure that your wrists are not bent up or down, turned inwards or outwards.