Lou Schuler is a National Magazine Award-winning journalist, a certified strength and conditioning specialist, and the author or coauthor of several popular books about diet and strength training. He has worked as fitness editor at Men's Fitness and fitness director at Men's Health, and has contributed to a long list of magazines, including Men's Journal, Fit Pregnancy, and Better Homes and Gardens. He lives in Allentown, Pennsylvania, with his wife and their three children.

Alwyn Cosgrove is co-owner, with his wife, Rachel, of Results Fitness in Newhall, California. He is a professional member of the National Academy of Sports Medicine and the American College of Sports Medicine, among other organizations, and is a frequent contributor to a variety of magazines, including Men's Health and Men's Fitness.