Episode 374: Zone 2 Cardio: What the Science Really Says (Pros, Cons & Better Options) with Kristi Storoschuk Podcast By cover art

Episode 374: Zone 2 Cardio: What the Science Really Says (Pros, Cons & Better Options) with Kristi Storoschuk

Episode 374: Zone 2 Cardio: What the Science Really Says (Pros, Cons & Better Options) with Kristi Storoschuk

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In this episode of the Flex Diet Podcast, I sit down with my friend Kristi Storoschuk, a PhD candidate in exercise physiology, to unpack her review paper on zone 2 cardio and what the evidence actually shows. We dig into what “zone 2” really means (including lactate thresholds and why common proxies like heart rate and the talk test can miss the mark), where the 80/20 endurance model came from, and why messaging around zone 2 for mitochondrial function, fat oxidation, metabolic flexibility, and health may be overstated, especially for the general population. Kristi explains why higher intensities often produce equal or better mitochondrial and performance-related adaptations, how training volume and population context change the conversation, and where low-intensity work like walking may still fit. Sponsors: Flex 4: Kristi's Top 4 tips for improving aerobic fitness as a recreational lifter: https://flex-diet.kit.com/17ac1beadeDaily Fitness Insider Newsletter: https://flex-diet.kit.com/bfa1510fa8 Coming up: ISSN 2026: https://www.sportsnutritionsociety.org/ Available now: Grab a copy of the Triphasic Training II book I co-wrote with Cal Deitz here. Episode Chapters: 04:04 Why Zone Two Went Viral09:40 Defining Zone Two Lactate14:15 Talk Test and Practical Limits16:43 Does Zone Two Even Matter21:08 The 80/20 Misapplied26:14 Origins of Base Training32:06 Mitochondria Volume vs Intensity40:08 How Myths Persist Online44:16 Zone Three Over Zone Two44:46 Why Some Recover Faster45:37 Overtraining Study Lessons49:59 Listen To Output Signals52:20 How Often To Train54:42 Short Daily Progressives57:46 Tabata Reality Check01:00:19 Walking And Health Outcomes01:05:23 Mitochondria Versus Performance01:08:04 Lactate Threshold Beats VO201:12:43 Fueling And Final Wrap01:14:33 Podcast Outro And Disclaimer Flex Diet Podcasts you may enjoy: Episode 360: Exploring Aerobic Development & Concurrent Training with Jason Brown YouTube: https://www.youtube.com/watch?v=lkqim0EDfec&t=4sEpisode 269: From Mitochondria to Metabolic Health Insights with PhD Candidate Kristi Storoschuk YouTube: https://www.youtube.com/watch?v=T9EFRluKt6Q Connect with : Instagram: https://www.instagram.com/krististoroschuk/Website: https://krististoroschuk.com/ Get In Touch with Dr Mike: Instagram: DrmiketnelsonYouTube: @flexdietcertEmail: Miketnelson.com/contact-us
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