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This was far too new-agey for my tastes, and seemed to cherry pick studies instead of quoting meta-studies. The larger message of the book (nasal-breathing is preferable to mouth-breathing, and slowing down breathing can lead to a host of health benefits) seem to be well substantiated. But portraying breathing techniques as a panacea to everything seemed a little hackneyed.

Quick read, and has some useful snippets. But wouldn't recommend it if you've done some form of breath-work in the past.