Another thing, I'm not much of an exercise expert, but what is going on when you reach that magical point of being warmed up and literally believe you could ride on forever? Man I love that feeling. It seems to hit between 5-10 miles for me and then it's like this very awesome experience. I noticed too that if I take too long of a break, I'll lose it and have to start again. That's just the best feeling! Whatever it is...