I bought this book thinking that it would tell me about breathing and running. Sort of what you would expect from the title.
In fact Dr Justin O'Brien has precious little to say about the subject, and I am at a loss to understand what "many athletes -- from Boston marathoners and national swimmers to international tennis players and Olympic badminton stars" have got out of it. None of these are named, nor provide testimonials, apart from one ultra-runner on the back cover blurb. Dr O'Brien's PhD is in the philosophy of consciousness.
The entire approach can basically be summed up with the words "train don't strain". Breathe easily, steadily and rhythmically using diaphragmatic breathing. Practise until you can breathe out for twice as long as you inhale, while running. Let your breath guide your degree of effort. That's it.
I can only think that this has been written for absolute beginners. It is out of date (written in 1985) and, for the experienced runner, packed with totally superfluous chapters such as "Why Run?", and "Internal Dynmaics" (ie what changes occur in the body as a result of running. There are also worthy, but out of date, chapters on injuries, flexibility and diet.
Not worth the money. The topic is better covered elsewhere, notably in John Douillard's "Body, Mind and Sport".