Wow, all this info is totally promising. I recall many years ago having my b/f at the time tell me that he read something about how cycling is one of the most energy efficient types of exercise... or something like that - meaning that it wasn't very good for burning calories. It never stopped me from doing it, but I did wonder how true it was. I'm very happy to hear the sport I LOVE really burns those calories! While you're having fun... so great.