Wrist pads may also be a good idea, since they reduce the leverage needed to use the mouse or keyboard. Take short breaks. If you have to check reports, try standing up to read them before going back to the computer. That will aid blood circulation and relieve pressure on the lower back. The lights should be neither too reflective nor too dim.
Lighting is a leading factor of neck pain.
When it's too dim, people tend to lean forward, and when it's too bright, users tend to shrink back, squint, or frown. Get a foot rest. To help relieve tension in the back, feet should rest parallel to the floor, i.e. no dangling. Using thick books or a stack of newspapers is a cheap, yet effective solution. Most people blink about 18 times per minute.