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Use "ultramarathons" in a sentence
"Deer and other animals run quickly for short amounts of time, but humans can, and do, frequently run 100 miles or more in ultramarathons without stopping."
"While a growing number of athletes are attempting incredible feats of endurance such as ultramarathons, scientists know little about the short- and long-term physical effects of such superhuman feats, says Reed Ferber, a researcher and director of the Running Injury Clinic at the University of Calgary."
"But it was his enthusiasms, including ultramarathons, roots music and philanthropy, and his outspoken disdain for cash accumulation as an end in itself, that set him apart."