To run a marathon is a great accomplishment. If you do that, then it’s just 5 more miles to complete a 50k race. Then a mere 19 more to knock out a 50-miler. Now it sounds really hard, but double that and you have a 100-miler. Well, this guy has shaped his life around doing these 50- and 100-milers, a couple dozen of them. Hear how (and why) one does that, and what it feels like. And he might even convince you that it's not as difficult as most people think!