Coaching practices for How to Measure Aerobic Fitness

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Does this sound like the set of challenges you might be facing?

• I want to start training my aerobic fitness but I have no idea where I actually stand right now, and I don’t have access to a lab
• I keep reading that VO2 max is the big longevity number, but I have no idea where I actually stand or whether I’m in the high-risk zone
• I’m putting in the training but I have no honest way to tell whether it’s actually doing anything, and I’d love one simple number I can check each morning to see if the work is paying off or if I’m just run down.
• I’ve been logging plenty of easy miles and my aerobic base feels solid, but the top-end number won’t climb
• I’ve been training for weeks and I genuinely can’t tell if I’m getting any fitter

Practices that may help

1. Assess your VO2max regularly with a validated field test
   You can’t target VO2max improvement if you don’t know your starting point — a field test gives an accurate proxy without lab equipment.
   VO2max Training
2. Assess your VO2 max with a field test or lab test
   Knowing your VO2 max gives you a quantitative longevity benchmark you can track and improve.
   VO2 Max and Longevity: Training Your Aerobic Ceiling
3. Track resting heart rate as a fitness marker
   Monitor morning resting heart rate over weeks as a simple, free proxy for cardiorespiratory fitness changes.
   VO2 Max and Longevity: The Peter Attia Framework
4. VO2 max intervals (Zone 4–5) to push your aerobic ceiling
   Four-minute intervals at near-maximal effort, repeated 4–6 times, are the most efficient way to raise your VO2 max.
   VO2 Max and Longevity: Training Your Aerobic Ceiling
5. Monitor recovery quality with post-exercise speech ease
   Tracking how quickly you can speak normally after a hard effort tells you whether your cardiovascular system recovered adequately.
   The Talk Test: Gauge Exercise Intensity Without a Monitor
6. Find your aerobic–anaerobic crossover with the talk test
   The moment comfortable speech breaks down marks your first ventilatory threshold — the ceiling of sustainable aerobic work.
   The Talk Test: Gauge Exercise Intensity Without a Monitor
7. Use RPE to set cardio intensity without heart rate monitors
   Target RPE 5–6 for aerobic base, 7–8 for tempo, 9–10 for intervals — all without needing a heart rate monitor.
   The RPE Scale
8. Zone 2 training to build aerobic base
   Low-intensity, sustainable aerobic exercise performed 3–4 hours per week develops mitochondrial density — the foundation of a high VO2 max.
   VO2 Max and Longevity: Training Your Aerobic Ceiling
9. Slow VO2 max decline with age through consistent training
   Highly fit 70-year-olds have VO2 max scores higher than sedentary 30-year-olds — consistent training largely determines your aerobic aging curve.
   VO2 Max and Longevity: Training Your Aerobic Ceiling
10. The Talk Test: Gauge Exercise Intensity Without a Monitor
    The talk test is a simple, validated method: if you can hold a full conversation comfortably, you are below the first ventilatory threshold (aerobic zone); if you can speak only a few words at a time, you are above the second threshold (hard anaerobic effort). Multiple studies confirm its correspondence to lab-measured ventilatory thresholds, making it one of the most practical intensity tools available.

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