I heard James Nestor interviewed on NPR, and I was intrigued enough by what he had to say about breathing that I went ahead and bought his book. I've spent a fair amount of time doing yoga and meditating -- concentrating on the breath is something I'm familiar with. Nestor turns much of that familiarity on its head. The different approaches to breathing he discusses I find provocative and some quite interesting, especially the link between breath and the current surge of autoimmune disorders, anxiety, and depression. He writes in an entertaining and engaging manner that made the book easy to read, though he falls short on backing up a lot of the science claims. In many way, the book was reminiscent to me of Born to Run. Both books offer a few key insights that I've taken with me into my everyday living/exercising.