LONGEVITY with Nathalie Niddam #335 Unlocking VO2 Max: TIME-Saving Secrets (Why Zone 2 Alone Won’t Cut It) | REHIT and Metabolic Health With Ulrich Dempfle
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May 16, 2025 
Ulrich Dempfle, an engineer and the mind behind the CAROL Bike, discusses groundbreaking advancements in fitness technology. He critiques the hype surrounding Zone 2 training and its limitations for most people, emphasizing the importance of VO2 max for longevity. Ulrich highlights the benefits of reduced exertion high-intensity interval training (REHIT) and how the CAROL Bike provides efficient workouts tailored for individual needs. He also explores the essential roles of strength and mobility for optimal health, particularly as we age.
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VO2 Max Crucial for Longevity
- VO2 max is the strongest predictor of life expectancy, more than weight or other health metrics.
- Improving VO2 max should be the primary fitness goal for longevity and vitality.
Zone 2 Impractical for Most
- Zone 2 training requires 3-5 weekly sessions of 60 to 90 minutes, totaling 4-8 hours.
- This time commitment makes Zone 2 impractical for most people, who cite lack of time as the top barrier to exercise.
Zone 2 Has Limitations
- Zone 2 is poorly defined and can be misleading without precise measurement.
- About 40% of people see no VO2 max improvement from only Zone 2 training even at recommended levels.