Erin Beresini is a journalist covering fitness, endurance sports, and health science. She is the author of ‘Off Course: Inside the Mad, Muddy World of Obstacle Course Racing.’ Like marathons and ...

PHOENIX (AP) – Obstacle course runners start on their feet, but eventually end up on their stomachs, sides, even backs at they clamber through mud, over shipping containers, across netting made of ...

It was one thousand or so steps for a handful of guinea-pig modern pentathletes, but it was one giant leap for the still nascent sport of Obstacle Course Racing. OCR—your Spartan Races, Tough Mudders, ...

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