Brian Mackenzie
#277,470 Most Popular
About
American fitness instructor and entrepreneur who is best recognized for having co-founded the Extreme Performance Training program. He is also known for having finished the Angeles Crest 100-mile endurance run.
Before Fame
He began studying altitude and hypoxic training in 2006.
Trivia
He published a book titled Power Speed Endurance.
Family Life
He married Olympic gold medalist Erin Cafaro MacKenzie.
Associated With
In March 2017 he posted a photo with fellow fitness instructor Emily Bridgers to his iamunscared Instagram account.
