THE RUNNING EFFECT PODCAST The #1 Running Scientist Who Helped Eliud Kipchoge Break 2 Hours In The Marathon Shares What Actually Makes Runners Faster — And What Most Are Getting Wrong
Apr 1, 2026
Dr. Brad Wilkins, a sports physiologist who modeled Nike’s Breaking2 and studies human endurance limits. He discusses what VO2max actually measures, why wearables can mislead, the real value of interval intent, altitude and heat adaptations, and why the brain often stops before the body. Short, sharp takes on training priorities versus tech and recovery tricks.
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What VO2max Actually Measures
- VO2max measures the maximum rate your body consumes oxygen, driven by cardiovascular delivery and muscle extraction.
- In elites delivery (heart and blood) usually limits VO2max more than muscle extraction, so improving heart/blood matters most.
Treat Watch VO2 Estimates With Caution
- Don't overvalue watch-estimated VO2max; devices use normative prediction equations and can be accurate only if you fit the norm.
- Validate your device by doing a lab VO2max test to know how far off its estimate is.
Make Short Workouts Count With Exhaustive Intervals
- For time-limited runners, do interval sessions that leave later reps exhausting so the anaerobic tank is drained by the final reps.
- Structure intervals (e.g., 6–8 reps) so rep 5–6 feels near failure to force adaptation.