Several years ago on a trip to Idaho, we met a couple who were doing a 400 mile "just for kicks" ride on their tandem. The previous summer they had ridden across the USA, the wife on a single while hubby and 9 yr old daughter rode a tandem.

Of course, the wife didn't lose any weight on that cross country trip and the husband turned into a bag of bones. He had to buy new shoes he lost so much weight and he wasn't overweight to begin with!