Charles investigates why some people and companies struggle to change, despite years of trying, while others seem to remake themselves overnight. He takes us to laboratories where neuroscientists explore how habits work and where, exactly, they reside in our brains. We discover how the right habits were crucial to the success of Olympic swimmer Michael Phelps, Starbucks CEO Howard Schultz, and civil-rights hero Martin Luther King, Jr. We go inside Procter & Gamble, Target superstores, Rick Warren’s Saddleback Church, NFL locker rooms, and the nation’s largest hospitals and see how implementing so-called keystone habits can earn billions and mean the difference between failure and success, life and death.