Are the Kenyans good at distance running through nature or nurture? Has their barefoot running style contributed to their success? It's an interesting question. The subtitle of this book claims that the author is "discovering the secrets of the fastest people in earth". Although it starts in that vein, with Finn wanting to discover how the Kenyans are so good at distance running, by a quarter of the way through the book he has shifted to a travelogue of his time training in Kenya. Finn moved to Kenya for six months with the intention of taking on the Lewa marathon. The middle sections are the weakest - we read about lots of fairly repetitive training runs. The end, where Finn describes the Lewa marathon, is much better. This book is a bit of a marathon in itself - a strong start with lots of enthusiasm, a bit of a drag through the middle, and a resurgent end.