Three runners did it twice to raise money for an elementary school.
Forty-four runners participated in a study that closely observed their bodies for thousands of miles.
The Maryland resident didn't discover ultras until he was 52 years old.
The American ultra marathoner held the lead for part of the champioship race.
Jonus Buud of Sweden and Kami Semick of the United States are the pre-race favorites.
Martin Parnell of Alberta, Canada has run 200 marathons this year. He hopes to run 50 more to raise money for charity.
The men’s and women’s course records fall by equal amounts of a perfect day for ultrarunning. Written by: Bryon Powell Fast