I would like to express my deepest thanks to the many runners, coaches, and others whose various contributions made this book possible and better: Richard Benyo, Amby Burfoot, Leah Flickinger, Josh Fitzgerald, Jeff Galloway, Christina Gandolfo, Dan Gilbert, Joe Henderson, Libbie Hickman, Deena Kastor, Jeremy Katz, Meb Keflezighi, Khalid Khannouchi, David Krummenacker, Kathryn LeSage, Bob Larsen, Cathy O’Brien, Andrea Pedolsky, Steve Plasencia, Robert Portman, Dathan Ritzenhein, Lou Schuler, Ryan Shay, and Joe Vigil.