Found this video on Singletrack.com of Jeremy Horgan-Kobelski (JHK) and his plans and thoughts about racing the Leadville 100 MTB race.

Having raced only a single 100-mile competition, which by the way wasn’t the Leadville Trail 100, Jeremy Horgan-Kobelski has a few thoughts about his coming foray above 10,200 feet on Saturday — like not blowing up.
Horgan-Kobelski, who normally races cross-country for the Subaru-Trek Mountain Bike Team, won the Bailey Hundo in Colorado last June, so he’s not a total greenhorn when it comes to endurance events. And he’s also won the 50-mile long mountain bike marathon national championships two years running.