We discuss Peter Attia's book, Outlive, which argues that modern medicine needs to shift from focusing on treating diseases after they have already taken hold, to a more proactive approach that prevents them in the first place. He advocates for a paradigm shift from "Medicine 2.0" to "Medicine 3.0", which focuses on enhancing healthspan (the number of healthy years lived), not just lifespan. To achieve this, Attia provides an actionable guide to improving longevity, covering aspects of metabolic health, exercise, sleep, and emotional well-being.