Here are two more common-sense suggestions:

1. Don't forget to take a break every so often. It's easy to get so deep into a project, the adrenaline starts flowing, and you lose track of time. You don't even realize how tight your muscles are until you finally stop.

2. Type gently. I knew somebody who would pound on the keyboard as if they were sitting at an old manual typewriter, and they eventually needed the carpal tunnel release surgery on both hands.