If you are looking for a simpler routine (to ease habit-formation), reddit also spawned the starting stretching guide.
I haven't done serious research and think it is not worth the time. As this HN comment points out, the science of fitness is poor. The solution is probably a combination of exercise, stretching and an ergonomic workstation, which are healthy anyway.
Thanks for the links! I'll probably at least try regular stretching, so that guide looks useful.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.