DULUTH — Last year, Michael Koppy was less than 7 miles from the finish line of the Arrowhead Ultra 135 when his body just gave out. He collapsed. He couldn’t move and had to be helped off the course.

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Training smart means mixing up the intensity of your runs – not just going out all-guns blazing on every effort. But distance, time and pace are all blunt tools for measuring effort, which is where ...

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