It might have more to do with the camping than the ride. Camping always took a lot out of me. I never got enough food, water or sleep. As a kid, you just sort of try to tough it out. In general, that's a bad strategy for CFers. I find that with adequate sleep, hydration and food, "exercise-exhaustion" (for lack of a better term) is rarely a problem for me. ALso, I can't emphasize enough the importance of GATORADE for CFers. You should be proud tho. I'd keep him cycling if you can!