Does the "physical fitness" of the elderly influence their lifespan? A 61% lower mortality risk suggests the "abilities to train"

When told to "exercise to live longer," many people are unsure of what exactly they should do.

Should they walk 10,000 steps every day? Start jogging? Or should they build muscles at the gym?

A large-scale study published in August 2026 provided intriguing hints to these questions.

The important factor is not merely whether one exercises or not.

Can you stand up, walk, maintain balance on one leg, or keep moving for a certain period?

In other words, maintaining the ability to use your body, or "physical fitness itself," could be a crucial indicator of health in old age.

The study found that elderly individuals with the highest overall physical fitness had about a 61% lower mortality risk during the follow-up period compared to those with the lowest fitness.

This is quite an impactful figure.

However, it would be premature to interpret this as "strength training reduces mortality by 61%."

What does this 61% figure mean, and how can we apply this research to our daily lives?

Let's also look at the reactions spreading on social media.

Tracking 13,423 people aged 65 and over for about 7 years

The focus is on a study from Taiwan published in JAMA Network Open on August 10, 2026.

The study involved 13,423 men and women aged 65 and over living in the community, with an average age of about 73, and about 60% were women.

Participants' physical abilities were measured between 2015 and 2016, and their mortality status was tracked until the end of 2022. The median follow-up period was about 7 years, during which 1,631 people died.

Interestingly, the researchers did not just ask, "How many times a week do you exercise?"

They had participants actually move their bodies and objectively measured their fitness through multiple tests.

The study examined four main areas:

Cardiopulmonary function
Muscle strength
Flexibility
Balance and agility

These four areas were assessed.

Therefore, this study is noted for capturing how well the body functions at present, rather than just assuming "I exercised."

The "four tests" strongly related to mortality risk

The abilities that showed a strong correlation with mortality risk were as follows:

One test was the "8-foot up-and-go," where participants stand up from a chair, walk about 2.4 meters, turn around, and sit back down.

In everyday life, this test checks if you can quickly stand up, walk safely, change direction, and sit back down.

The group with the best performance had about a 59% lower mortality risk compared to the lowest-performing group.

Next, standing on one leg stood out.

The group with the highest balance ability had about a 50% lower mortality risk.

In a test measuring how many times participants could stand up from a chair in 30 seconds, the top-performing group had about a 45% lower mortality risk.

When cardiopulmonary function was measured through a two-minute step exercise, the top group showed about a 42% lower mortality risk.

When comparing the "comprehensive fitness index," which combines multiple abilities, the adjusted mortality hazard for the top 20% was 0.39 compared to the bottom 20%.

In other words,it was about 61% lower.

This is the basis for the reports of a "61% reduction in mortality risk."

"Muscle mass" alone cannot explain it

What is particularly interesting about these results is that simple arm strength was not the only important factor.

When discussing longevity and elderly health, the topic of "building muscle" often comes up.

Of course, muscle strength is important.

However, looking at the data, it seems that the combination of balance, agility, lower body strength, and cardiopulmonary function is crucial.

For example, weakened leg strength makes it difficult to stand up from a chair.

Decreased balance increases the risk of falling.

If you can't quickly change direction, your ability to avoid people or obstacles decreases.

If cardiopulmonary function declines, even a short walk can leave you breathless, reducing outings altogether.

This leads to decreased activity, muscle loss, and further immobility.

Such a vicious cycle is more likely to occur in old age.

Researchers also point out that balance, agility, and lower body strength may be related to preventing falls and fractures and maintaining independent living.

Therefore, the important thing is not "making muscles bigger."

It's about retaining the ability to move your body as you wish.

The "least fit" individuals are actually the key

Another important aspect of this study is that the relationship between fitness and mortality risk was not a perfect straight line.

It's not a simple matter of "the more you increase your fitness, the infinitely lower your mortality risk becomes."

Rather, when looking at overall fitness, the significant difference was between the least fit group and those above them.

This is a very important point.

When looking at health information,

"You must exercise five times a week,"
"100 squats,"
"10,000 steps every day,"
"Strength training four times a week,"

such high goals often catch the eye.

However, for the elderly, acquiring athlete-level fitness may not be what's truly important.

Moving a little from a state of almost no movement.

Increasing the number of times you stand up.

Walking around the neighborhood.

Using the stairs for just one floor instead of the elevator.

Doing balance exercises in a safe environment.

These changes from "zero to one" may hold significant meaning in reality.

Stairs might surprisingly be a longevity exercise

The original article also highlights stairs.

In a large-scale analysis by research teams including the University of East Anglia, data from over 450,000 participants showed that those who regularly used stairs had a 39% lower risk of death from cardiovascular disease and a 24% lower overall mortality risk compared to those who did not.

The benefits of stairs are clear.

Unlike walking on flat ground, you have to carry your body weight upwards against gravity.

This uses muscles in the thighs, buttocks, and calves, and also increases heart rate.

In other words, it provides "aerobic exercise + lower body load" in a short time.

Some data in the study showed significant benefits with the use of approximately six flights, about 60 steps, of stairs per day.

However, this does not mean that "60 steps is the magic number."

Researchers also state that further research is needed to determine the optimal amount.

The important thing is not to search for a number of steps that will ensure longevity, but to incorporate short bouts of exercise into daily life.

Using the stairs for just one floor at the station.

Walking consciously on the stairs at home.

Parking the car a little further away when shopping.

No special workout clothes or expensive gym memberships are needed.

Utilize the load within daily life.

Strength training still cannot be ignored

Previous studies have shown a certain direction regarding strength training.

A systematic review and meta-analysis published in the British Journal of Sports Medicine in 2022 confirmed that those who engage in muscle-strengthening activities tend to have lower risks of all-cause mortality, cardiovascular disease, and cancer compared to those who do not.

Regarding all-cause mortality, a roughly 10-17% risk reduction is reported in association with muscle-strengthening activities.

However, this does not prove that "strength training will definitely extend your lifespan."

On the other hand, it is quite understandable that muscle strength supports functional living in old age.

Standing up from the toilet.

Getting up from the futon.

Climbing stairs.

Carrying shopping bags.

Bracing yourself when about to fall.

Many of these actions require muscle strength.

In youth, strength training is often seen as "exercise to change appearance," but in old age, its meaning changes.

It becomestraining to maintain the ability to live independently.

WHO does not recommend "aerobic exercise only"

The World Health Organization (WHO) also recommends exercise that includes strength and balance, not just aerobic exercise, for people aged 65 and over.

The basic recommendation is 150-300 minutes of moderate-intensity aerobic exercise per week, or equivalent activity.

Additionally, it is recommended to engage in muscle-strengthening activities using major muscles at least two days a week, and for the elderly, to incorporate comprehensive exercises focusing on balance and strength at least three days a week.

The important thing is not to think "it's meaningless if you can't do it all."

WHO itself suggests that doing some physical activity is better than none.

For someone with almost no exercise habit, aiming for 300 minutes a week might lead to giving up.

Start by walking for 10 minutes.

Stand up from a chair five times.

Increase the number if you can continue.

In reality, this kind of accumulation becomes more important.

On social media, reactions range from "it's all about strength training" to "what about causality?"

This study has been featured on X and Instagram since its release.

On X, posts sharing the JAMA Network Open paper itself can be seen, and on Instagram, fitness and health accounts are introducing the study in connection with "elderly muscle strength," "longevity," and "balance ability."

The number "61%" is particularly well-suited for social media.

The phrase "61% lower mortality risk if in the top fitness group" is very eye-catching.

For those who continue strength training and healthy habits, this study easily reinforces the belief that "exercise is indeed important."

However, when research on exercise and mortality rates becomes a topic on social media, a certain reaction almost always appears.

That is,

"Are they healthy because they exercise, or can they exercise because they are healthy?"

This question arises.

In Reddit's science community, comments on related studies about physical fitness and mortality include suggestions like "healthier people might be more capable of exercising" and "it's difficult to eliminate all factors like socioeconomic status and lifestyle habits."

This is a very important perspective.

In the Taiwanese study, age, BMI, socioeconomic factors, medical history, and self-reported exercise habits were statistically adjusted.

Still, the researchers themselves state, "As this is an observational study, causality cannot be proven."

Limitations include not directly adjusting for smoking status and the possibility of selection bias, where relatively healthy people are more likely to participate in physical tests.

When only looking at numbers on social media,

"Increasing fitness lowers mortality by 61%"

tends to be the interpretation, but scientifically,

"A strong association was confirmed that elderly individuals with high fitness have a lower subsequent mortality risk."

is a more accurate expression.

Still, the significance of building a "movable body" is great

If causality cannot be proven, does this