Brian MacKenzie is the mastermind and creator behind 3fu3l; Erin Cafaro (now Erin MacKenzie) is the elite athlete and guinea pig who tested it out to prove it works at the elite level. We talk about what it was like creating 3fu3l, testing it out during Erin's workouts, and the best ways they've found to incorporate 3fu3l into their overall nutrition protocol.

Brian is creator of 3fu3l and Crossfit Endurance. Erin is an elite rower, and holds 2 Olympic gold medals in the Women’s 8+ event from the 2008 Olympic games in Beijing and 2012 Olympic Games in London.

• Brian MacKenzie on Twitter
• Erin Cafaro MacKenzie on Twitter

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Produced by Aaron Olson