I spent the last two years obsessing over strength. Deadlifts, carries, progressive overload. The numbers went up. My conditioning quietly collapsed.
Then I did Hyrox.
Reader, I suffered. Not the glorious, character-building kind. The “my lungs are staging a coup and my legs have filed for independence” kind.
It was clarifying.
Here’s what I’ve been thinking about since.
The fitness world has been sold on VO2max as the single greatest predictor of longevity. Peter Attia made it famous. But the data behind the flagship claim has a problem. The key study cited in Outlive didn’t measure VO2max at all. It measured METs (Metabolic Equivalents), a broader proxy for how hard you can exercise. VO2max doesn’t appear in the source paper. The other major mortality studies used treadmill time and peak speed. The meme spread faster than the methodology.
What the research actually shows: cardiorespiratory fitness, your general aerobic capacity, powerfully predicts longevity. Not a specific lab number.
This matters for two reasons.
First, VO2max is measured in mL of O2 per kilogram of bodyweight per minute. Weight is literally in the denominator. Losing body fat improves your score mathematically, without changing your engine at all. Aerobic fitness and body composition are the same investment.
Second, you don’t need a lab test. Pick a route. Run it, walk it briskly, it counts. Time it. Come back in six weeks. The only number that matters is beating yesterday’s. No mask, no treadmill, no looking like a stressed hamster wired to expensive equipment. Your local park is a perfectly valid longevity clinic.
I also avoided running for years to protect my knees. There is now evidence that impact loading is actually good for bone density. The body adapts to the stress you give it. Avoiding load doesn’t preserve you. It diminishes you.
Everything in moderation. Including moderation.
Strength is the hardware. Cardio is the operating system. I had powerful hardware that kept crashing.
Zone 2 three times a week. Hyrox redemption pending.
