Atomic Habits

James Clear published his framework for habit formation in 2018 and it became the fastest-selling self-help book of the decade, selling over 15 million copies in its first five years and spending over 200 weeks on the New York Times bestseller list. Its core insight — that a 1% improvement compounded daily produces transformative results over time, and that identity-based habits are more durable than outcome-based ones — gave readers a practical, non-moralistic framework for behaviour change that resonated across fitness, business, and personal development communities worldwide.