Grip Strength Predicts Mortality. Should You Train It?
One of the most reliable predictors in epidemiology is how hard you can squeeze a device. The obvious conclusion is also the wrong one.
The PURE study, published in the Lancet in 2015 by Leong and colleagues, followed roughly 140,000 people across seventeen countries. Grip strength, measured with a handheld dynamometer, predicted all-cause mortality and cardiovascular mortality — and did so more strongly than systolic blood pressure.
That finding has been replicated widely. It is one of the more robust associations in the field.
It has also produced a straightforwardly incorrect inference: that you should train grip strength to live longer.
Why grip strength predicts anything
Grip is a proxy. It correlates with total muscle mass, with overall neuromuscular function, with nutritional status, with nervous system integrity, and with the accumulated burden of chronic disease. It is a cheap, fast, reliable window onto systemic robustness.
The dynamometer is not measuring your forearms. It is measuring you.
The same logic applies to gait speed, chair-stand time and the sit-to-rise test — all excellent predictors, all proxies, none of them worth training as an end in themselves.
What actually underlies the signal
If grip strength indexes overall muscular and neurological function, the intervention that moves the underlying variable is comprehensive resistance training. Not a gripper.
Sarcopenia — age-related loss of muscle mass and function — is the thing worth intervening on, and it is genuinely modifiable at essentially any age. Resistance training produces hypertrophy and strength gains in nonagenarians. The evidence there is unusually good, including randomised trials in frail elderly populations.
Where grip training is legitimately useful
Not as a longevity intervention, but as a training one:
- Grip is frequently the limiting factor in pulling movements. If your deadlift or row is capped by your hands rather than your back, that is a real constraint worth addressing.
- Carries — farmer's walks, suitcase carries — train grip alongside core stability, posture and work capacity. They are efficient and they transfer to actually carrying things.
- Climbers and grapplers need it for their sport, which is a different justification entirely.
Straps are a reasonable tool for heavy pulling, incidentally. The idea that using them makes you weak confuses the proxy with the thing again.
What to do instead
If longevity is the goal, the evidence points to compound resistance training two to three times a week covering the major movement patterns — squat, hinge, push, pull, carry — with progressive overload. That builds and maintains muscle mass across the body, which is what grip strength was telling you about in the first place.
Your dynamometer reading will improve as a side effect. That is the correct causal direction.
The general lesson
This pattern recurs constantly in health data. A cheap measurement correlates with an outcome, and the measurement gets targeted instead of the cause. Grip strength, resting heart rate, HRV and VO2 max are all in this family — though VO2 max is a partial exception, because the training that raises it is the same training that produces the benefit.
Ask what the marker is a marker of. Then train that.
General information, not medical advice.
