Maintain proper posture, paying careful attention to positioning of head, neck/spine, arms/wrists, hips/thighs and feet. Basically, ensure the small of your back is supported, your shoulders relaxed (not slumped, not elevated), and that there is no pressure under your thighs.
Alternate between different postures on a regular basis.
When keyboarding, use minimum force while striking the keys.
Take frequent mini-breaks throughout the day to give muscles and joints a chance to rest and recover

"How to sit at a computer" es una web donde se dan una serie de consejos a la hora de trabajar delante de un ordenador. Desde como sentarnos a como utilizar el ratón, con consejos prácticos apoyados en gráficos.