Grip strength, sitting-rising test, one-leg stand: three simple fitness tests for healthy aging

Maybe you know other versions of this scene. You sit down on the rug to play with a child. To get back up, you need both hands and the edge of the sofa. Or you put on a sock while standing and have to hold on to the dresser.

None of this is dramatic. You do not feel sick, and your last checkup was unremarkable. And yet you sense it: something has shifted.

This is exactly where three simple tests come in. Grip strength, getting up from the floor and standing on one leg. Together, they take just a few minutes. In large studies, all three are linked to health in later life.

In this article, I will show you what the research says and where its limits lie. I will show you how to do the tests safely at home. And above all, how you can use them as a compass for your training. Not as a verdict.

Why your hand, the floor and one leg, of all things?

When you think about healthy aging, you probably think of blood tests. Of your heart, blood vessels and memory. Hardly anyone thinks of a jar of jam.

Yet your independence depends on very practical things. Gripping. Getting up. Not falling over. If you can do these three things, you get through everyday life well. If you lose them, you need support.

Research groups these abilities under the term physical capability. It is measured with surprisingly simple tests. Squeezing a measuring device with your hand, getting up from a chair, standing on one leg, walking speed.

My view on this: these tests do not measure your age. They measure your reserve.

Reserve is the gap between what you can do and what everyday life demands of you. Imagine a river. As long as enough water is flowing, you notice nothing of the stones on the riverbed. When the water level drops, they appear. A flight of stairs, a heavy suitcase, a slippery sidewalk.

Researchers at the US National Institute on Aging have put this image into numbers. I will introduce their study shortly, in the section on the grip strength test.

All values after adjustment for age, sex and other factors. They describe groups, not individuals.

And now you know why such small tests get so much attention in aging research.

The grip strength test: What your hand can reveal about your whole body

Think about the jar again. Or about two full shopping bags on the way up to the third floor. Or about a handshake that seems to tell you something about the other person straight away.

Your hands are in constant use. That is exactly why you often notice only late when they get weaker.

What large studies show

Grip strength is measured with a hand dynamometer. This is a measuring device that you squeeze with one hand. It displays your strength in kilograms. Sounds trivial. And yet this test is one of the most thoroughly studied measurements in aging research.

What grip strength did not indicate in PURE is just as interesting. It was not associated with new-onset diabetes, fall-related injuries or fractures. So your hand is not an oracle for everything.

Two large meta-analyses now each pool data from more than three million people. In the first, with 42 studies, every 5 kilograms less was associated with a 16 percent higher risk of death. In the second, with 48 studies, the risk of death fell almost evenly with every additional kilogram between 26 and 50 kilograms.

Based on Leong et al. 2015, Wu et al. 2017 and López-Bueno et al. 2022. All three papers are based on observational studies.

When does the decline begin? An analysis of twelve British studies with almost 50,000 people shows three phases. Men reached a median of 51 kilograms between the ages of 29 and 39. Women reached 31 kilograms between the ages of 26 and 42.

Based on Dodds et al. 2014, pooled data from twelve British studies. Weak grip strength was defined there as at least 2.5 standard deviations below the peak value of young adults of the same sex.

Why your hand can be a window

Maybe you are asking yourself now: What does my hand have to do with my heart? A fair question. Nobody knows exactly yet. But there are plausible explanations on several levels.

The muscle level. A review from the US describes grip strength as a marker of overall strength, falls, nutritional status, mood and cognitive performance. But it is worth taking a second look here. A study with 960 people from five cohorts compared hand strength and leg strength directly. The association was only weak to moderate, with correlations between 0.35 and 0.57 depending on the group. So grip strength alone is not a reliable stand-in for the strength of all your muscles.

The nerve level. A strong grip needs more than muscles. It needs a clear radio message from the brain. Full strength only develops when many motor units fire at the same time and in good coordination.

Simplified physiological model. The grip can lose strength at each of these stages.

The immune level. Silent, chronic inflammation is like a smoke detector beeping quietly in the background. You barely hear it, but it costs energy. On a mechanistic level, researchers discuss the idea that persistent inflammatory signals can shift the balance between muscle building and muscle breakdown.

Metabolism and hormones. Muscles are also a large metabolic organ. I describe how closely muscle and blood sugar are linked in the article on strength training for diabetes and insulin resistance. Hormones have a say too. You can find out why muscle balance can shift during menopause or with falling testosterone in the articles on strength training during menopause and testosterone and strength training.

Another perspective comes from the anthroposophical understanding of the human being. There, the hands and legs belong to the metabolic-limb system, the realm of the will. This is not a finding from studies, but an image. I like it anyway: strength in your hands and legs is will in action.

How to test your grip strength

To get an actual number, you need a hand dynamometer. Devices like this are available for home use, and many physiotherapy and medical practices measure grip strength as well. Without a device, you will not get a reliable number, only an impression.

And what is a good value? The European Working Group on Sarcopenia in Older People names clear warning thresholds for low muscle strength. For men, the threshold is below 27 kilograms, for women below 16 kilograms. If you are below that, it is a reason to have it checked by a doctor. You can find more about muscle loss with age in the article on sarcopenia.

Important: these thresholds are warning lines, not target values. Your values depend on your age, sex, height and the measuring device. Your own trend over time tells you more than comparing yourself with others.

Without a device, you can only observe. Are the jar, the crate of water bottles, the full bag getting harder than they used to be? That is not a measurement. But it can be a good reason to take a closer look.

Does my grip strength tell me how long I will live?

And now you know why, when a jam jar is stuck, I think about more than just the lid.

The sitting-rising test: How you get back up from the floor

When did you last simply sit down on the floor? At a picnic, while playing with children, while searching under the sofa?

Sitting down usually still works. Getting up is where it gets interesting. Do you roll onto your side? Do you push yourself up with both hands? Do you reach for the coffee table?

A team at CLINIMEX, an exercise medicine clinic in Rio de Janeiro, turned this everyday movement into a test. It is called the sitting-rising test, or SRT for short. The task sounds simple: from standing, sit down on the floor and stand back up. With as little support as possible. Speed does not matter.

By the way: after 25 years, the study from Hawaii also checked whether the men could get up from a chair without using their arms. Getting up is a key movement for independence.

My view: the sitting-rising test does not measure a single ability. It shows how well your body works as a team. Your hips, knees and ankles need enough mobility. The strength in your thighs, glutes and trunk has to be sufficient. Your balance has to hold. And your body weight determines how much you have to move in the process.

If flexibility is the bottleneck, you will find ideas in the article on flexibility and fascia. If your knee hurts, read the article on exercise with knee osteoarthritis first.

How to do the sitting-rising test at home

And now you know why a picnic on the grass can also be a small health check.

The one-leg stand: Ten seconds that can tell you a lot

You are standing in the bathroom in the morning, stepping into your pants. One leg in the air, a brief sway, a quick hand against the wall. Maybe you laughed about it. Maybe not.

We only notice balance when it is missing.

The researchers from Rio de Janeiro write that balance declines rapidly from the mid-50s onward. This increases the risk of falls. They wanted to know whether a simple test reveals even more.

In the test, the free foot rested behind the standing leg. The arms hung loosely, and the gaze rested on a point at eye level. Up to three attempts were allowed.

The British birth cohort also pointed in this direction. There, the one-leg stand with eyes closed was somewhat more closely linked to mortality than grip strength and chair rise speed.

Balance is teamwork in the nervous system

Standing on one leg looks easy. For your nervous system, it is a high-performance task. Three sources of information constantly come together.

Your eyes report which way is up and which way is down. The balance organ in your inner ear measures every tilt of your head. And sensors in the soles of your feet, your muscles and your joints report how your weight is distributed at this moment.

Your brain and cerebellum process these signals in fractions of a second. Then they send tiny compensating commands to your foot, knee and hip. Imagine a tightrope walker listening to three radios at once and constantly making adjustments. That is roughly how your body works when you stand on one leg.

So balance is not purely a muscle issue. It is a conversation between your eyes, inner ear, feet and brain. I describe what your feet can contribute in the article on walking barefoot and posture.

How to test your one-leg stand

And now you know why putting on a sock while standing is a small balance test.

From verdict to compass: What you can do with your results

Maybe you have already tried the tests while reading. And maybe one of the results does not feel good right now.

That is a very human reaction. Numbers linked to mortality can be frightening.

A distinction from Marshall Rosenberg's Nonviolent Communication can help here: observation instead of evaluation. “I can stand on my left leg for six seconds” is an observation. “I am old and wobbly” is an evaluation. You can work with the observation. Not with the evaluation.

What training can change

The good news: the abilities behind the tests can be trained. There are solid studies on this.

One question remains open, and I want to name it clearly. So far, nobody knows for sure whether a better test result also lowers the risk of death. The authors of the PURE study write themselves that exactly this still needs to be investigated.

That is why I see the three tests as a compass. They show you a direction. You walk the path with training that suits you.

With a weak result, functional medicine additionally asks why. Is the muscle getting enough protein and enough movement stimuli? Is silent inflammation running in the background? How are sleep, stress and hormones? And which medications could affect strength or balance? These are questions, not diagnoses. But they can broaden the view.

The three tests capture strength, flexibility and balance. A fourth building block is endurance. You can read why it also counts for healthy aging in the article on VO2max and life expectancy.

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Strength, muscles and balance are linked to nutrition, weight and lifestyle. These articles explore the neighboring levels in more depth.

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