T.J. Murphy, NASM CPT, is a veteran journalist and editor who has coauthored two New York Times best sellers, Unbreakable Runner, with Brian MacKenzie, and Ready to Run, with Kelly Starrett. His feature writing has appeared in Outside Magazine, Runner’s World, Spartan.com, and Triathlete Magazine. T.J. is a 2:38 marathoner who has finished five Ironmans. His first foray into writing about general fitness was the book Inside the Box: How CrossFit® Shredded the Rules, Stripped Down the Gym, and Rebuilt My Body. T.J. lives in Boston with his wife, Gretchen, and their two kids, Milo and Maddie.
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.