The Top Reasons Ultrarunners DNF

Why did you drop out of the race? What was your biggest issue? Jason Koop describes the top reasons ultrarunners abandon the race.

Should I Run or Power-Hike This Hill?

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The accepted wisdom among ultrarunners is that if you can’t see the top of the hill, you should hike it. But Jason Koop suggests a more scientifically validated cutoff pace for deciding whether to power hike or run.