I used a walking desk for 4 months straight at 2 mph for 6 hours a day. The first few months where good but then I started getting terrible hip and joint pains.

I used a walking desk for 4 months straight at 2 mph for 6 hours a day. The first few months where good but then I started getting terrible hip and joint pains. I ended up quitting because it hurt too much. After the fact, I think I just wore out my shoes and had no dampening left in them. Get good shoes...often.