Breathing is not a wellness trend. It is a direct intervention on your autonomic nervous system, and the mechanism has been tested in controlled trials for decades (Zaccaro et al., 2018, Strong).
This 68-page guide covers 7 breathing techniques. Each one carries its mechanism, its protocol, and an inline grade on the evidence behind it: Strong, High confidence, or Contested. Where the usual explanation for a technique is not supported by the research, the book says so in the sentence and gives the account that is.
Second edition, corrected. A “What Changed in This Edition” section at the back names every error found in the July 2026 audit and its correction, including claims that were removed outright. A standard that has never publicly corrected anything is decoration.
Three PDFs:
- Breath Mastery guide: 68 pages, 8 figures, 22 sources with DOIs verified against the publisher record
- Breath Protocol Decision Card: A5, printable, maps the situation to the technique
- 30-Day Nervous System Training Log: A5, printable, tracks stress recovery speed