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% of their full capacity.