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Race your heart—or stomach—out

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Matt Kleberg eating a dozen doughnuts at the halfway point of the Krispy Kreme Challenge in Raleigh, N.C. (Photo by Jennifer Sherwood)


A team emerges from the mud pit, the final obstacle of the Muddy Buddy Ride and Run. (Photo courtesy of Competitor Group, Inc.)

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Adding doughnuts, costumes, mud pits, battles between the sexes—you name it—to the traditional mix, a number of oddball races are inserting a sense of lighthearted fun back into the increasingly serious sport of running.