Workspace+Exercise Hack: The Treadmill Desk
http://rura.org/blog/2007/11/14/the-treadmill-desk-exercise-for-the-sake-of-hacking/For the past 3 months, I've been walking about 8 hours each workday. The benefits are not just physical: the constant exercise keeps me focused and helps avoid slumps. It's been a big boost to my quality of life and work.
See my blog post for the full story, with how-to and pictures.