Jocko Willink had served as the US Marine Corps for 20 years, after his discharge, he became an author who inspire people about life, healthy lifestyle and discipline.
In Discipline = Freedom, he describes his secret as follows: mental and physical discipline should have freedom in every aspect of life. Many books have provided advices on how to overcome obstacles and achieve your goals, but those advices often ignore the most important components which is discipline. Without discipline, there will be no real progress.
Discipline = freedom is included all things, with strategies and tactics to conquer weaknesses, procrastination, and specific physical training shown in training for beginners and intermediate athletes and advanced, even including tips on good sleeping and eating habits to optimize performance.
In the spirit of the soldier who came out of the army, author Jocko Willink personally "trained" the reader to practice serious, focused thinking, aimed directly at the goal ahead and advance, take a disciplined lifestyle, lead you to the place that gives you the things you expect:
Stronger. Smarter. Faster. Stronger. Better.
AND FREEDOM.