Confidence starts with keeping the promises you make to yourself. This guide covers how willpower works, how to use it well, and how to quiet the thoughts that hold you back. How willpower works Willpower is limited, and it's what lets you follow through on promises to yourself. To build confidence, it helps to understand it. Kelly McGonigal's book "The Willpower Instinct" is a good place to start. She has a Ph.D. and teaches a willpower class at Stanford. Willpower also works like a muscle: the more you use it, the stronger it gets. At first, building good habits and working toward goals takes extra effort. Over time, your whole self-concept can change. Use your willpower when it's strongest When do you have more willpower: tired, hungover, and hungry, or rested, fed, and motivated? The second, obviously. So schedule your day around your peak hours. A morning routine is one way to do that. Meditation, exercise, cold showers, and outdoor walks all fit. Do your har...