It occurred to me this morning that our bodies will react well if we simply don't use modern "labor-saving devices" when we don't need to. If you live 10 miles from work, you probably need transportation. If your office is on the 10th floor, though, you don't need to take the elevator. Take the stairs, and do it regularly. Once will do you no good. 10 times and you will start to feel good. Take any opportunity to burn up some of those calories. Little amounts burned add up, just as do little amounts consumed.