What a great read. It's a real page turner if you are an endurance athlete trying to learn more about how your brain influences performance. Alex is an excellent writer and brings a real passion for endurance athletics to this book. This is a balanced and scientifically sceptical view of how athletes, science and corporations like Nike and Red Bull are pushing the boundaries of human performance. The hook for me was the story of the sub 2 hour marathon attempt from 2017 that was spread throughout the book.