This is the third book written by ultra marathoner Dean Karnazes about his crazy long distance running exploits. His first book was a compelling read about how he became an ultramarathoner, whereas his second book centered on his project to run 52 consecutive marathons in every state of America. While still an engaging read, this book is the weakest of the three, because it doesn't have as clear a focus. Rather it's a mash of Dean's thoughts about long distance running combined with descriptions of some of the races and events that he's taken on in the past couple of years. There are large segments that rehash territory he's covered before: Long distance running hurts/you get hungry/you chafe etc.
Dean's friendship with Topher and Topher's evolution as a runner is one theme that continues throughout the book and Topher even contributes a chapter describing his first 100 mile event. I also enjoyed reading about Dean's participation in the "4 Deserts" series - ultramarathons in the Atacama Desert, Gobi Desert, the Sahara Desert and Antarctica.
Towards the end Dean introduces his next goal. Starting November 2012, he wants to spend a year running a marathon in every single country in the world. Sounds impossible, exhausting and potentially dangerous: but never count out Karno.