ultra-running
US /ˈʌl.trəˌrʌn.ɪŋ/
UK /ˈʌl.trəˌrʌn.ɪŋ/
1.
the sport or pastime of running races longer than the traditional marathon distance of 42.195 kilometers (26.2 miles)
:
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She has completed several ultra-running events, including a 100-mile race.
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Ultra-running requires extreme endurance and mental toughness.