"The human body has limitations," Karnazes says. "The human spirit is boundless." Your mind, in other words, is your most important muscle. As a running buddy told him: "Life is not a journey to the grave with the intention to arrive safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow!! What a ride!"
- Wired Magazine: Dean Karnazes ran 50 marathons in 50 days. He does 200 miles just for fun