Just 12 men have walked on the moon, and only three more than that have completed the Barkley Marathons, a fantastically quirky and random endurance test in the rugged mountains of Tennessee. One of those men is John Fegyveresi, a man who didn't even take up competitive running until adulthood, but on that weekend ran for nearly 60 hours into immortality. Oh, and did we mention that he spends most winters in Antarctica studying glaciers and other effects of climate change? Yeah, he's also run a marathon at the South Pole, too. Who hasn't? Listen to how John took a down moment in his life to begin living fully!