07/19/2026
I’m going to challenge one of the prevailing narratives in the longevity movement.
Grip strength and dead hangs are frequently promoted as predictors—even potential drivers—of longevity. But are they actually causing healthier aging, or are they simply revealing the physiological adaptations that got someone there?
This is a classic scientific question: correlation versus causation.
A person with exceptional grip strength has likely spent years resistance training, building lean muscle, improving metabolic health, strengthening connective tissue, maintaining a healthy body composition, and preserving neuromuscular function. Likewise, someone who can perform a two-minute dead hang didn’t achieve that by hanging alone. They developed the shoulder stability, mobility, tendon resilience, and relative strength that made the hang possible.
So what’s the real intervention?
Is it the grip test…or everything it took to excel at the grip test?
Now, to be fair, there are valid counterarguments.
Grip strength may not be merely a passive biomarker. Training grip can improve neuromuscular function, resistance exercise itself is strongly associated with reduced mortality, and dead hangs can improve shoulder health, tendon capacity, and functional movement. It’s entirely plausible that these exercises contribute to healthier aging.
But even if that’s true, are they unique longevity interventions? Or are they simply one expression of a broader principle—that building and maintaining a resilient musculoskeletal system is what truly matters?
We don’t claim that a low resting heart rate causes cardiovascular fitness. We recognize it as evidence of years of cardiovascular adaptation. We don’t argue that an HbA1c creates metabolic health—it reflects it.
Perhaps grip strength and dead hangs deserve the same perspective.
Maybe we’re placing too much emphasis on optimizing the metric instead of optimizing the biology that produces the metric.
I’d love to hear from colleagues, exercise physiologists, sports medicine physicians, physical therapists, and longevity researchers.
Am I missing evidence that demonstrates an independent causal effect, or are we at risk of confusing an excellent biomarker with the underlying mechanism?
