This document is an introduction to the book "No Excuses! The Power of Self-Discipline for Success in Your Life" by Brian Tracy. It discusses how self-discipline is the key to success and achievement. Most people make excuses for why they have not achieved their goals, but self-discipline allows one to overcome excuses and obstacles to achieve great things. The development and practice of self-discipline can change one's life by enabling them to accomplish more than they ever thought possible.