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Back in 2024, I wrote a post asking if a high VO2max makes you healthy, or if it’s just a byproduct of being healthy.
At the time, I argued that having a high VO2max actually improves your health, rather than just being a side effect. My logic was that to improve your VO2max, your body must improve the performance of your heart, lungs, and vascular system, which naturally decreases the risk of disease.
I also noted that while VO2max is important, most people don’t need to stress over the exact number or do grueling 4-minute intervals to get the benefits. Simply walking, hiking, or doing easy cardio is enough for most busy guys to see massive improvements.
Well, new research has come out that provides a much clearer answer to that original question. And it turns out, my initial assumption about the cause-and-effect relationship was slightly off—but my practical advice was dead on.
If you listen to the current wave of longevity influencers and biohackers, you are still being told that you need to push your VO2max into the stratosphere to live a long time. For busy dads juggling a career and family, this messaging is overwhelming.
Before you completely overhaul your training to chase a number on your smartwatch, let’s look at what the latest science actually says. A new study reviewed in the MASS Research Review (July 2026) finally settles the debate: Is a high VO2max actually driving longevity, or is it just a consequence of doing other healthy things?
The New Science: Cause Or Consequence?
A fascinating new study used a technique called Mendelian randomization to figure out what is actually causing what [1]. This method uses genetic data to strip away confounding variables and look at true cause-and-effect relationships.
The researchers tested whether a high VO2max actually causes better health outcomes (like longevity and lower diabetes risk), or if other factors cause both.
The findings were eye-opening:
- VO2max does NOT causally increase longevity.
- VO2max does NOT causally prevent diabetes.
Instead, the study found that VO2max is largely a consequence of other healthy behaviors and traits. The factors that actually drive longevity and metabolic health are:
- Maintaining a low-to-moderate body fat percentage.
- Having plenty of muscle and lean mass.
- Being physically active on a regular basis.
In other words, VO2max is simply “along for the ride.” People who lift weights, manage their body fat, and stay active naturally tend to have a higher VO2max. But it’s the muscle, the leanness, and the activity that are actually keeping them healthy—not the oxygen metric itself.
What This Means For The Busy Professional
This research is incredibly freeing, and it perfectly validates the practical advice I gave in my original VO2max post.
It means you can stop stressing over complex cardio protocols designed solely to spike your VO2max score. You don’t need to train like an elite endurance athlete, and you don’t need to suffer through miserable high-intensity intervals if you hate them.
If you are training for a specific endurance sport, then yes, your VO2max matters. But if you are training to be a strong, capable, and healthy father and professional, your playbook is much simpler.
The Real Playbook For Longevity
Instead of obsessing over a single cardiorespiratory metric, focus on the fundamentals that actually move the needle:
1. Build And Maintain Muscle
Resistance training is non-negotiable. Muscle mass and strength are critical drivers of metabolic health, physical function, and longevity. Prioritize lifting heavy things a few times a week.
2. Manage Your Body Fat
You don’t need to be shredded, but maintaining a healthy body fat percentage is one of the most powerful things you can do for your long-term health. This comes down to consistent, sensible nutrition—not extreme diets.
3. Accumulate General Physical Activity
As I’ve said before, you don’t need to do grueling VO2max intervals to be healthy. Aim for the standard guidelines: 150 minutes of moderate activity (like brisk walking or cycling) per week, or simply aim for 8,000 to 10,000 steps a day.
4. Don’t Forget The “Soft” Stuff
The researchers and reviewers note that true longevity isn’t just physical. It requires social connectedness, cognitive challenges, and a driving sense of purpose. Being present with your family and engaged in your life is just as important as your time in the gym.
The Bottom Line
If optimizing your VO2max gets you excited to join a running club and be more active, that’s fantastic. But if it’s just adding stress to your already full plate, let it go.
Check the foundational boxes: lift weights, manage your body fat, get your steps in, and enjoy your life. If you do those things, your health—and yes, your VO2max—will take care of itself.
Want a personalized plan that cuts through the noise and focuses on what actually works for your busy life? Reach out — let’s build a strategy that gets results without the overwhelm.
References
[1] Kjaergaard, A. D., et al. (2025). Cardiorespiratory Fitness, Body Composition, Diabetes, and Longevity: A 2-Sample Mendelian Randomization Study. Journal of Clinical Endocrinology & Metabolism, 110(5), 1451–1459. As reviewed by Trexler, E. (2026) in MASS Research Review, Volume 10, Issue 7.