Last Saturday I rode with a racer dude I'd previously only 'met' on line. He holds many of the KOM's at local trails, and has done some grueling races that I wouldn't even think of attempting. When we met in person for the first time, I was shocked to see how fat he was! I don't mean to suggest that he's morbidly obese, but he could easily lose 50 lbs.
I can't understand how he could ride so fast and have so much endurance, given all that extra weight he's carrying around. Wouldn't that be an enormous liability for a bicycle racer?