For anyone interested in the topic, I strongly recommend reading "What Doesn't Kill Us" [1], by Scott Carney. Scott is an investigative journalist who initially

For anyone interested in the topic, I strongly recommend reading "What Doesn't Kill Us" [1], by Scott Carney. Scott is an investigative journalist who initially planned to debunk Wim Hof's [2] (aka the Iceman) methods, and ended becoming one of Wim's biggest followers, and publishing a NYT best-selling book telling his journey. It's a fascinating story, and covers a lot of the science behind breathing techniques, how our autoimmune system works, and step-by-step process to take advantage yourself. ps: if you want a TL;DR, here's an interview [3] with Scott that summarizes the book well. [1] https://www.amazon.com/What-Doesnt-Kill-Environmental-Conditioning/dp/1623366909 https://www.amazon.com/What-Doesnt-Kill-Environmental-Condit... [2] https://en.wikipedia.org/wiki/Wim_Hof https://en.wikipedia.org/wiki/Wim_Hof [3] https://www.dragondoor.com/interview_with_scott_carney_author_of_what_doesnt_kill_us/ https://www.dragondoor.com/interview_with_scott_carney_autho...