William Barth, a Boston Marathon qualifier and low heart rate training advocate, shares his journey from injuries to joyful running. He discusses the benefits of MAF training and balancing intense workouts with mindful practice. Barth emphasizes intuitive training, understanding one's body, and the importance of strength training to prevent injuries. He also offers insights on race day strategies, including pacing and nutrition, while encouraging non-elite athletes to embrace consistent, intentional training for better performance.