Ergonomics ("ergon" - work, "nomoi" - natural laws)
You see a lot of ads for ergonomic office equipment - ergonomic keyboards, ergonomic chairs, ergonomic mice, and whatever else they could tack "ergonomic" onto.
Alexander Technique - become aware of your unnecessary movements and gradually eliminate them.
Alternative input devices - for people with repetitive stress injury or carpal tunnel syndrome. You know how a keyboard forces your hands together and your shoulders to hunch when your keyboard's in the wrong position? Well, some people have this really bad. There are split keyboards, curved keyboards, not-really-keyboards keyboards, and other alternative input devices for people who can't use normal keyboards.
Some useful sites: http://www.ergonomics.org