I'm interested in reading this book Jacob. Richard Nash's brother Frank (who I met on the recent skiing trip) followed this type of run training and he has run a 2:27 marathon and 1:06 for a half marathon. He also said weight is key. When you weigh less you run faster and are less prone to injuries. Some of his other training methods were daft (even he admits that) though, such as doing up to 7 hour bike rides on fluid (mainly water) alone