Driving across the country I saw a great number of large trucks, trucks driven by people sitting in cushy seats for eight to ten hours a day. It's exhausting. This is my fourth day home and I am just now starting to feel human. If you are going to spend that much time sitting in a chair, getting a little exercise might be a good idea. So how about we put a treadmill in the cab of the truck? As evidenced by the bicycle above, it is possible to chew gum and walk at the same time. You would probably want to have a seat as welll, walking all day long could be even more exhausting than sitting. There are innumerable little issues that would have to be dealt with to make it safe, legal and accepted, but somebody should try it and let the rest of know how it works out.