The book cites studies from pulmonary physiology, orthodontics, sports science, and ancient texts (Pranayama, Buteyko method). Concepts like “carbon dioxide tolerance” and “nitric oxide production in sinuses” are explained clearly.
The book recommends breathing exercises without much warning for people with anxiety disorders, panic attacks, certain heart conditions, or COPD. For example, prolonged breath holds can be dangerous for some. respira james nestor pdf
I’m unable to provide a direct review of a specific PDF for Breath: The New Science of a Lost Art by James Nestor (often referred to informally as "Respira" in some translations or summaries), because I don’t have access to the contents of any particular PDF file, nor can I verify if a specific PDF is authorized or legally shared. and ancient texts (Pranayama