Pierce Mattie Public Relations New York

For many of us, the mere thought of running a marathon makes us want to sit down. And for the more motivated, Olympic gold medalist Frank Shorter advises, “You have to forget your last marathon before you try another. Your mind can’t know what’s coming.”

Well, for Ultramarathon Man, Dean Karnazes, the memory of his last race is still fresh in his mind because Karnazes has run 50 marathons, in 50 states, in 50 consecutive days.

If that’s not shocking enough, starting tonight, in Times Square, Karnazes plans to break a world record by running for 24 solid hours on a treadmill on a billboard as part of the launch of the new energy drink, Accelerade.

Need to see it to believe it? Dean starts his mission at midnight, but get there early.

And be careful where you stand, because at that height, he literally will be sweating bullets.