I live about 45 minutes from where the Barkley is held at Frozen Head (almost) every year so I knew of the race and how extreme it was and what the location and its terrain encompasses but never knew much more than that. Michiel Panhuysen did a great job of letting readers get a behind the scenes, or behind the Yellow Gate if you will, look at just how extreme the Barkley is and what it takes to compete in it. I also enjoyed reading about some of the other ultra events the author described running in across the world in preparation for Barkley that I had never heard of before, along with stories and insight from other Barkley competitors about their Barkley races that he became friends with over the years. I am definitely not a runner, ultra or otherwise, and really enjoyed this book.