Is Zone 2 cardio really the key to fat loss and longevity—or is it totally overhyped? In this episode, Ulrich Dempfle (CEO of CAROL Bike) returns to reveal why the science behind Zone 2 training is confusing, how it’s often misapplied, and why most people would benefit more from a faster, smarter method: REHIT (Reduced Exertion HIIT). You’ll learn: - Why Zone 2 cardio lacks a clear definition (and how most people do it wrong) - How REHIT can improve VO₂ max in under 10 minutes per session - Why women may want to focus more on strength and intervals than Zone 2 - What clinical trials say about REHIT vs Zone 2 for metabolic health - How AI tech like CAROL Bike makes training safer, smarter, and more effective - How two 20-second sprints can outperform 90 minutes of low-intensity cardio If you're looking for efficient fat loss, better cardio health, or just want to stop wasting time, this episode is packed with surprising insights and science-backed strategies. Full show notes: https://bengreenfieldlife.com/zone2myth Additional Resources: Ben Greenfield Life Website: https://bengreenfieldlife.com/ Ben Greenfield Life Podcast: https://bengreenfieldlife.com/podcast/ Ben Greenfield Books: https://shopbengreenfieldlife.com/collections/books Instagram https://www.instagram.com/bengreenfieldfitness/ Facebook https://www.facebook.com/BGFitness X https://twitter.com/bengreenfield TikTok https://www.tiktok.com/@bengreenfield