Back problems
nathanb: I'm going to have to go with the AOL comment on this one. I had both upper and lower back pain. A proper understanding of how my back can get pulled into awkward positions and what stretches/posture corrections are necessary to prevent this has eliminated it thus far without having to make any equipment changes (buying new chairs, desk trays, etc.).Tim Ferris also recommends changing your shoes (http://www.fourhourworkweek.com/blog/2009/05/07/vibram-five-...) or your chair (http://www.fourhourworkweek.com/blog/2009/01/27/office-chair...) if stretches/exercise doesn't cut it for you.