T.J. Murphy is a veteran journalist, endurance athlete, CrossFitter, and former editorial director of Triathlete, Inside Triathlon, and Competitor magazines. He is author of Triathlete Magazine's Guide to Finishing Your First Triathlon and contributor to Start to Finish: 24 Weeks to an Endurance Triathlon. His writing has also appeared in Outside magazine and Runner's World. He is a five-time Ironman finisher and a 2:38 marathoner.
Brian MacKenzie is a strength and conditioning coach and the creator of CrossFit Endurance, which specializes in movement with an emphasis in running, cycling, and swimming mechanics. MacKenzie and his program have been featured in Competitor, Runners World, Triathlete, Men's Journal, ESPN Rise, The Economist, Outside, and Tim Ferriss' bestseller The 4-Hour Body. He has consulted with several teams, including the 2012 Western Athletic Conference Champions San Jose State Women's Swim Team.