Discipline is Destiny by Ryan Holiday.
The Power of Self-Control.
In Discipline is Destiny, Holiday draws on the stories of historical figures we can emulate as pillars of self-discipline, including Lou Gehrig, Queen Elizabeth II, boxer Floyd Patterson, Marcus Aurelius and writer Toni Morrison, as well as the cautionary tales of Napoleon, F. Scott Fitzgerald and Babe Ruth. Through these engaging examples, Holiday teaches readers the power of self-discipline and balance, and cautions against the perils of extravagance and hedonism.