For some runners, a marathon is not enough.Participation in so-called ultramarathons - defined as any distance beyond the standard 26.2-mile marathon - has grown exponentially in recent years. The number of runners who finished ultra-length races in North America increased from 15,500 in 1998 to 63,530 in 2012, according to UltraRunning Magazine. More... Support MuscleMecca by visiting our sponsorsSimilar Bodybuilding Threads: Marathon running 'bad for the heart' Children with better muscle health had improved metabolic and heart health Health and fitness habits 'influence health over next two decades' Ayr Gold Cup Races 2013: Runners, Riders and Betting Tips for Day 3 Glex: I've Got Runners Trot
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