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g-force speeds of nascar, these men and women, some barely in their teens excel to the extreme. what s their secret? dr. sanjay gupta finds out in this week s series extreme living. he beginning withen ultramarathoner. one who tackles races of more than 150 miles a pop and one of the fastest runners in race history. in a moment, sanjay goes one-on-one. but first, we go up close with the racer and athlete defying all odds. scott has been called the king of pain. and the greatest ultramarathoner ever. ultramarathons can be 125 miles longer than a typical 26-mile marathon. scott finished his first in 1994 and since then, he s dominated the sport. today he holds records for races that cover more than 150 miles and last over 24 hours straight. a notoriously tough ultramarathon is the 135-mile

Sanjay guptaExtreme livingWithen ultramarathonerG forceMen and womenThe king of pain