Do you want to strengthen your mind and build an iron will that can carry you through to success? Do you want to develop the mental toughness to set and achieve your goals? Do you want to do all of that without giving up after a few short weeks? Forging yourself into a disciplined, confident leader who stays focused and driven is hard. You start out so motivated. But a few days later, doubt creeps in. It's small at first. A question. Am I...