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Endurance isn’t a straight line — it’s a steep curve.

In this episode of the I Don’t Know Running Podcast, Lewis and Mitch break down the “endurance curve”: how each distance milestone (5K → marathon → 50K → 50 miles → 100 miles → 200+) filters runners out for totally different reasons. Past a certain point, it stops being “fitness” and becomes life management — nutrition, decision-making, heat, sleep deprivation, and emotional regulation.

We talk about:

Why the marathon is already rare (and what “rare” actually means)

Why 50K is the most “accessible” ultra

Why 50 miles is where the sport shifts into management mode

Why the 100-mile distance is a psychological breaking point (and the DNF reality)

The wild world of 200-mile events: dirt naps, hiking, and multi-day survival

Why the ultra community feels different — and why that matters

⚠️ Note: We reference several stats and percentages that are best understood as directionally accurate (databases vary and participation tracking isn’t perfect). The goal is the big idea: how quickly the field narrows as distance increases.

If you’ve ever wondered “Am I really an ultrarunner?” or felt the pressure of “the next thing”… this one’s for you.

Question for you: What distance felt like the biggest shift for you — marathon, 50K, 50 miles, or 100?

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