From power breathing to underwater workouts to Wim Hof-style cold water immersion to sexy Training Masks to freediving, spearfishing and beyond, it seems that performance breathwork is taking the world by storm. In today's podcast, I take a deep dive with performance breathing expert Brian Mackenzie. Brian is a strength and conditioning and movement expert, and creator of CrossFit Endurance (which I interviewed him about way back in podcast episode #47) He co-authored the book “Power, Speed, Endurance: A Skill Based approach to Endurance Training", recently co-authored “Unbreakable Runner” and works with professional and elite level athletes in running, cycling, rowing, MMA, MIL/SOF, LEO, Fire/EMT, surfing, paddling, swimming, CrossFit, including Olympic Gold Medalists and World Champions. Brian and his programs have been featured in Competitor Magazine, Runners World, Triathlete Magazine, Men's Journal, ESPN Rise, The Economist, Tim Ferriss' New York Times bestseller The 4-Hour Body, Men's Running UK, LA Sport & Fitness, Muscle & Performance Magazine, and Rivera Magazine.

During our discussion, you'll discover:

-The true science behind the Training Mask, and whether it actually works...

-How to use oxygen and carbon dioxide static apnea tables...

-Why so many freedivers and spearfishers are dying from shallow water blackouts...

-The uncommon restricted breath training devices Brian uses in his clinics...

-How to use hyperoxia... -Where to start if you want to hold your breath for four minutes...

-And much more!

Resources from this episode: -This TrainingMask workout -The TrainingMask (use code GREEN1 for 20% discount) -The PowerLung (use code BGF025 for 25% discount) -FINIS Swim Snorkel -TheTurbine nasal dilator -Power, Speed, Endurance book -Unbreakable Runner book -Deep Survival: Who Lives, Who Dies, and Why book

Do you have questions, comments or feedback about performance breathing? Leave your thoughts at BenGreenfieldFitness.com and either Brian or I will reply!

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