This book offers practical strategies to help readers build lasting habits by focusing on smart design rather than willpower alone. Drawing on data from millions of users of Japan's top habit-forming app, the author presents three key principles that significantly increase success rates. Ideal for busy individuals struggling with procrastination or short-lived motivation, it provides actionable tips to make habits easier to maintain and integrate into daily life. Written in an encouraging and accessible tone, it empowers readers to overcome common challenges and achieve consistent personal growth.