David Zinczenko
CEO of Galvanized Brands & Consulting Editorial Director of Men's Fitness

A world-renowned strength and conditioning coach and the innovator of the endurance, strength and conditioning paradigm. He authored the book “Power Speed Endurance: A Skill Based approach to Endurance Training” and recently co-authored “UnBreakable Runner”. MacKenzie created CrossFit Endurance, which specializes in movement with an emphasis in running mechanics and programming.
From his firm belief that nutrition is the foundation of all athletes, MacKenzie developed his own performance and recovery supplement, 3FU3L, and now owns the nutritional supplement company Sports Fuel, Inc. He is also the creator of the Unscared Inc.
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Looking to book Brian MacKenzie for your next event? As a CrossFit Endurance Founder, Brian MacKenzie brings a powerful story and engaging presence to corporate events, conferences, leadership programs, charity galas, and special appearances. Speaking fees for Brian MacKenzie vary based on event location, type, and duration. Speaker Booking Agency offers transparent pricing and will provide a detailed quote tailored to your event needs. To check availability, request a quote, or learn more about booking Brian MacKenzie, contact Speaker Booking Agency at 888-752-5831 or submit a booking request.
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CEO of Galvanized Brands & Consulting Editorial Director of Men's Fitness
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