This book distinguishes itself by providing a practical, science-based approach, empowering athletes and coaches to make informed decisions rooted in exercise physiology. Tracing the evolution of endurance training, the book presents a comprehensive view of cardiovascular function and energy metabolism. Beginning with fundamental concepts, it progresses through detailed explorations of the heart, blood vessels, and respiratory system, culminating in practical training plans, nutritional guidelines, and recovery strategies tailored for various endurance sports like running, cycling, and swimming.