In this episode, I talk about the Physiologic Flexibility Certification open from April 20 to April 27 and where to get all the details.At the core is physiologic flexibility, which is your body’s ability to adapt, perform, and recover across different stressors, not just optimize one thing. I break down the four key systems that drive this: temperature, pH, fuels (carbs, fat, lactate, ketones), and breathing (O₂/CO₂), and how they all work together.We also get into why AI can miss the physiology, how a 30-second Wingate hits all four pillars, and how to apply this to real-world training with 40+ practical takeaways.