I've ridden the Tour de France (on a stationary spin bike) for many years.
For the past three years Lance Armstrong, George Hincapie, Phil Legget and a few other Postal/Discovery guys have helped raise $6 million for cancer research in Calgary by joining 35 of us mere mortals on rides in the Banff area. Him at the front and me with a lock on the back. I don't think there is a more intensely driven individual in any sport. Frightening.
He called these rides recovery level while most of us were seeing spots and reaching for the defib paddles. They are NOT human.