Ari talks with Brian MacKenzie, creator of Crossfit Endurance and author of Power Speed ENDURANCE: A Skill-Based Approach to Endurance Training. MacKenzie seeks to optimize endurance training by strengthening an athletes body using Crossfit exercises and focusing on specific technique. For Brian, the goal is to get an athlete moving as efficiently as possible by exploiting weakness in an athletes movement and fixing the weakness through crossfit style strength training.

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