The Science of Self-Discipline: The Willpower, Mental Toughness, and Self-Control to Resist Temptation and Achieve Your Goals (Live a Disciplined Life Book 1)

by Peter Hollins

The 40% Rule is straightforward. It says that when an individual’s mind begins telling them that they are physically or emotionally maxed out, in reality they have only pushed themselves to 40 percent of their full capacity.