Definition of "ultramarathons" []

• Plural form of ultramarathon. (noun)

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• "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."