Road and mountain bike professional racers are among the fittest athletes in the world, but did you know many top-ranked motorcycle and automotive racers use intensive cross-training with bicycles to improve and maintain their fitness? Specialized sees a huge potential in tapping into the motorsports market, and has sponsored several big-name athletes, beginning with Ricky Carmichael in 2004. Now multiple national champion dirt and road racers James "Bubba" Stewart and the Hayden brothers are training upwards of six days a week on their Specialized mountain and road bikes, building stamina for their throttle-twisting day jobs.