Some of my favorite quotes:
SHOW YOUR BODY WHO'S BOSS: "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!"
GET USED TO IT: "To prepare for the searing heat of the Badwater race, Karnazes went on 30-mile jogs wearing a ski parka over a wool sweater. He trained himself to urinate while running (emphasis added). He got so he could go out and run a marathon on any given day – no mileage buildup or tapering required. This training made the extreme seem ordinary and made the impossible seem the next logical step"