ultramarathon

(redirected from Double-marathon)
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Any foot race that is longer than a marathon—which is 26.2 miles/42 km—usually either a timed event that cover a specified distances—50 or 100 km or miles—or an event measuring distance covered during a specified time
Injuries Electrolyte imbalances, water intoxication, cerebral hyponatremia, hyponatremic encephalopathy

ultramarathon

Sports medicine A footrace that is longer–eg, > 50 miles/80 km–than a marathon–26.2 miles/42 km. See Marathon.
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References in periodicals archive ?
Thirty-eight hardy runners took part in the first-annual "Worth The Hurt" double-marathon, departing the start/finish line on San Francisco's Embarcadero at midnight Sunday to run the course in reverse.
Last summer, it was a 54 mile double-marathon from Maidenhead to London.
LONDON, July 20, 2010 /PRNewswire/ -- On Saturday 17th July, the time had finally arrived for Double-Marathon Mayhem