Even if you're not an avid runner and has never done a marathon, let alone an ultramarathon, you should read the book. In addition to his personal story of how he, despite his physique, has completed a 50-mile run with American ultramarathon sizes and the best Tarahumara, he gets more and sometimes the "path" from and reports from the famous Leadville 100 Mile Trail Run on the have in 1993 and 1994 also participated Tarahumara explains Anne Trason who graduated in 1994 the route in legendary 18 hours 6 minutes (just 30 minutes behind the winner) or why the modern, air-cushioned shoes that cost more than 200 euros worse as the 15 Euro "violators" of Aldi & Co are. There are many more such stories and eventually will be, at least for me it was so, immediately start running lace and his running shoes. So if you just have a deep motivation should definitely take up this book, all the others to learn in an entertaining way the world of ultra runners and of course know the Tarahumara.
Although I have "only" heard the audio book, but I found the language very simple and easy to understand and believe that you can get away good English very well.