What is an ultramarathon, how far and on what terrain?

Ultra running is exploding in popularity around the world, but what actually constitutes ‘ultra’ in an ultramarathon?
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Ultra running is fast becoming a mainstream sport. Once, it was the realm of a few crazy runners, and not the pastime of everyone from your boss to your neighbour. But what actually is an ultramarathon?

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What is an ultramarathon, how far and on what terrain?

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What Is an Ultramarathon?