BRAD STULBERG researches, writes, speaks, and coaches on health and human performance. His coaching practice includes working with athletes, entrepreneurs, and executives on their mental skills and overall wellbeing. He is a columnist at Outside Magazine and has written for The New York Times, New York Magazine, Sports Illustrated, Wired, Forbes and The Los Angeles Times. Previously, Stulberg worked as a consultant for McKinsey and Company, where he counseled some of the world's top executives on a broad range of issues. An avid athlete and outdoor enthusiast, Stulberg lives in Northern California with his wife, son, and two cats. Follow him on Twitter @Bstulberg.

STEVE MAGNESS is a coach to some of the top distance runners in the world, having coached numerous athletes to Olympic trials, world championship teams, and the Olympics. Known widely for his integration of science and practice, Steve has been on the forefront of innovation in sport. He has been a featured expert in Runner's World, the New York Times, the New Yorker, BBC, the Wall Street Journal, and ESPN The Magazine. His first book, The Science of Running, was published in 2014. He lives in Houston, Texas. Follow him on Twitter @SteveMagness.