Bio:
Brian Mackenzie is an innovator in human performance on stress adaptation and a pioneer in the development and application of custom protocols to optimize human health and performance. His work harnesses and integrates respiratory, movement, strength, conditioning and endurance-based training approaches to elicit unprecedented positive results. His protocols have been used to accelerate and raise both mental and physical performance in world-class Olympic and professional athletes, top executives, and elite military operators, as well as to improve the health for people suffering from various chronic and pathological issues. 
Brian’s work is voluntarily and repeatedly subjected to rigorous 3rd party scientific testing, re-testing and improvement, at top institutions. He has been contracted and his work involved in research projects at Stanford University School of Medicine, California State University Fullerton, and San Francisco State University. 
Brian is himself a highly accomplished practitioner. He completed the Ironman (Canada, 2004), completed both the The Western States 100 mile and The Angeles Crest 100 mile runs using adapted training protocols he developed to improve performance. He is the co-founder of The Art of Breath a division of Power Speed Endurance that teaches a principles based approach to breath & performance. Brian has also co-authored the book Power Speed Endurance, The New York Times Best Seller UnBreakable Runner, and UnPlugged, which assesses the integration of emergent technology and human performance. His programs have been featured in Outside Magazine, Men’s Health, Runners World, Triathlete Magazine, Men’s Journal, ESPN Rise, as well as periodicals such as The Economist. Brian and his protocols have been featured in 2 of Timothy Ferriss’ New York Times bestselling books including: “The 4-Hour Body” and “Tools of Titans” and Scott Carney’s New York Times best seller “What Doesn't Kill Us”.
His clients have included: Ari Emanuel, William Morris Endeavor, Sheppard Mullin, Deloitte, Google, Tim Ferriss, U.S. Military (Navy, Army, Marines), Canadian Military (CANSOF), San Quentin State Prison, The UFC Performance Institute, Altis, Jon “Bones” Jones, Laird Hamilton, Tia Clair Toomey (3X CrossFit Games Champion), Rich Froning Jr. (4X CrossFit Games Champion) and many others. 
Currently, Brian is the Founder & CEO of Power Speed Endurance. He is also the President and Co-Founder of The Health and Human Performance Foundation, a non-profit organization dedicated to researching how breath and innate tools can optimize and help health and human performance.
Show Notes:Websites and Social Media Links: 
Website – brianmackenzie.com
Website – powerspeedendurance.com 
Facebook – Brian MacKenzie
Twitter –  @brianmackenzie
Instagram – _brianmackenzie
Books Mentioned:
Power, Speed, EnduranceUnplugged
Brian’s Book Recommendation(s):
Behave
Deep Survival
People and Resources mentioned:
Fergus ConnollyWim HofPatrick McKeown 
Andrew HubermanRob Wilson
Weston A. Price Kevin OgarRobert Sapolsky Laurence Gonzales
Mark TwainCarl Jung
Time-Line:0:00 – 4:36 - Robbie intro’s the show and asks Brian to introduce himself 4:37 – 7:44 - Robbie asks Brian the response of his athletes and clients to breath work
7:45 – 12:43 - Robbie asks Brian about assessment and training interventions around breath work
12:44 – 14:28 - Robbie asks Brian about anxiety and breath training 
14:29 – 23:00 - Robbie asks Brian about some misconceptions around breath training 
23:01 – 25:24 - Robbie asks Brian about “buy-in” with breath training 
25:25 – 28:20 - Robbie asks Brian about breath work prescription
28:21 – 34:49 - Robbie asks Brian how he got into breath work and who are his biggest influences?
34:50 – 41:56 - Robbie asks Brian how his training in breath work helped him recover from a life-threatening neck injury
41:57 – 46:46 - Robbie asks Brian what he learned from his neck injury?
46:47 – 51:40 - Robbie asks Brian how he learns?
51: