Grip Strength: The Health Marker Martial Arts Trains Without Telling You

There is a measurement in medicine that keeps outperforming what it has any business outperforming. It is grip strength, and you measure it by squeezing a device called a dynamometer as hard as you can.

Martial arts that involve grabbing — which includes Hapkido, with its joint locks and wrist control — load the grip constantly without ever calling it training. It is worth knowing what the research actually says about that, including the parts that do not support the conclusion people want to draw.

What the research found

The large one is the PURE study analysis, led by Darryl Leong and published in The Lancet in 2015. It enrolled 142,861 people across 17 countries and analysed 139,691 with known vital status.

The headline result: each 5 kg reduction in grip strength was associated with a hazard ratio of 1.16 for all-cause mortality (95% confidence interval 1.13 to 1.20). The same 5 kg drop was associated with higher cardiovascular mortality (hazard ratio 1.17), higher non-cardiovascular mortality (1.17), and with incident heart attack and stroke.

The finding that got attention was this one: grip strength was a stronger predictor of all-cause and cardiovascular mortality than systolic blood pressure. The associations held similarly across countries of every income level, with the exception of cancer and hospital admission for respiratory illness.

Now the part that gets left out

This is an association, not a causal chain, and the authors said so explicitly. They wrote that further research was needed to identify the determinants of muscular strength and to test whether improving strength reduces mortality and cardiovascular disease. That second question is still open.

The most likely reading is that grip strength is an unusually good proxy. One squeeze captures something about total muscle mass, neurological function, nutritional status, inflammatory burden and general robustness — a single cheap number that summarises how much structural reserve a body has. Which means a weak grip is a signal of something, not necessarily a cause of it.

The practical implication is less exciting than the headline but still real: training that builds genuine whole-body strength, grip included, is training that moves the thing the marker is measuring. Squeezing a tennis ball on the sofa to move your dynamometer score is gaming the proxy, not changing the underlying picture.

So: do not read this article as "grip training prevents death." Read it as "grip strength tracks something important, and real training raises it as a side effect."

Where martial arts loads the grip

In a joint-lock art, grip is not an accessory. It is the mechanism.

• Wrist and sleeve control. Every joint-lock entry starts with taking a grip and keeping it while your partner resists. This is sustained isometric work at exactly the intensity the dynamometer measures.
• Breaking a grip. The other half: freeing your own wrist from someone holding it. This loads the forearm differently, through rotation rather than squeeze.
• Holding on through movement. Maintaining a grip while both people are moving loads the forearm flexors for far longer than a gym set would.
• Falling and catching. Breakfall practice loads the hands and forearms repeatedly, in impact rather than in squeeze. See breakfall training for what that work involves.
• Uniform work. Gripping thick cotton is harder than gripping a bar, because the hand cannot close fully. Grapplers' forearms are built largely on this.

Striking arts load the grip much less. A clenched fist is not a sustained squeeze. This is one of the genuinely distinct physical differences between a pure striking curriculum and one with grappling in it, and it is a fair question to ask any school you are considering.

What this is worth in daily life, honestly

Not dramatic, but specific and noticeable, and it compounds with age.

• Opening jars and valves, carrying shopping in one trip, holding a toddler who has decided to lean.
• Carrying luggage without changing hands every thirty metres.
• Catching yourself with your hands when you trip, which depends on arms and hands that can accept load.
• In older adults, grip strength is one of the components used in clinical frailty assessment, which is precisely why it is measured in the first place.

What we do not claim

We are not going to tell you martial arts training is the best way to build grip strength. If raw grip strength were the only goal, dedicated loaded carries and deadlifts would beat it, because they let you load more weight for longer.

What martial arts does is build it as a by-product of doing something you will actually keep doing twice a week for years. That is the part that matters more than peak efficiency. The best grip programme in the world does nothing if you stop in six weeks, and our article on strength training for martial artists covers how to combine the two rather than choosing.

The measurement you can take yourself

If you want a reference point, a hand dynamometer costs less than a month of most gym memberships. Take three readings on each hand, record the best, retest in six months.

Two cautions. Grip strength varies enormously by age and sex, so comparing yourself to a population average without matching for both tells you nothing — compare yourself to yourself, six months ago. And treat a single low reading as a prompt to look at your general strength and health, not as a prognosis. It is a marker, not a verdict.

At KIMOO

Hapkido is a joint-locking art, and it is one of the arts we teach in Santa Clara at 2181 El Camino Real, Santa Clara, CA 95050. Our Grand Master is certified 8th Dan in Hapkido and trained at the Korea Hapkido Headquarters Dojang, where the art originated.

That means the grip work in our adult classes is not a conditioning add-on bolted onto a striking syllabus. It is the syllabus. Call (408) 243-1001 for adult class times and to book a free trial class. New students receive a free uniform and white belt on enrolment.