The Physiology of Endurance Running Podcast · Dan Nash and Owain Zerilli

Your guide to Zone 2!

·1 hr 28 min·5 clips

Using 220 minus your age for max heart rate is “absolute nonsense,” the hosts say.

1. The Physiology of Endurance Running Podcast frames “Your guide to Zone 2!” around the idea that Zone 2 is “literally everywhere.” 2. Ben and Owen host the episode, and they matter because they are trying to separate sports-science definitions from the way runners use the term on Strava and Instagram. 3. The episode asks what Zone 2 actually is, how it can be defined with and without a lab, and what training adaptations it should produce. 4. The hosts say the series will move through the different training zones and intensity domains, then apply them to real training plans. 5. Ben says the hype around Zone 2 is linked to influencers, a barber-shop conversation, and a feeling that the term has become too common. 6. Owen argues that people expect definitive answers from sports science, but “that’s not how sports science works.” 7. The hosts contrast easy running as a practical habit with Zone 2 as a label that sounds precise but is often used loosely. 8. They say the top of Zone 2 is usually defined by LT1, the first lactate threshold, and by the highest speed where lactate does not meaningfully rise above resting levels. 9. Ben gives a lab-style example using 10, 11, 12, 15, 16, and 17 kilometers per hour to show how LT1 is identified. 10. Owen notes that scientists usually talk about intensity domains, while coaches often split the moderate domain into Zone 1 and Zone 2 for convenience. 11. The hosts say there is no consensus on where the bottom of Zone 2 sits. 12. They explain that below LT1, lactate, pH, stress hormones, and breathing change along a continuum rather than at a clean breakpoint. 13. Ben says a useful Zone 2 needs enough width to matter in training analysis, not a five-beat range that is too narrow to use. 14. Owen gives a real-world example from Brett Robinson, who can run easy at about 3:50 per kilometer despite being a 2:08 marathoner. 15. The hosts use that example to show that absolute pace and metabolic intensity can point in different directions depending on the runner. 16. They also mention that a runner with a lower fitness level has less speed available before crossing into harder work, so a broad Zone 2 may be less useful. 17. For practical prescription, the hosts talk through RPE, heart-rate drift, and how a stable heart rate on a one-hour run can suggest the right intensity. 18. They also mention Garmin-style zone estimates, heart-rate reserve, and the idea that a 40-mile evenly paced ultra can line up with LT1. 19. The tone is conversational, argumentative, and coaching-focused, with the hosts correcting each other and testing ideas against lived training examples. 20. Listeners who coach runners or track heart rate will get the most from it, while people wanting fixed rules for every pace may skip it.

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