By Muhammad Shabbir
Publication Date: September 17, 2026
Getting older does not automatically mean losing the ability to move well, stay independent, or remain physically active.
But researchers increasingly recognize that how well a person can perform everyday physical tasks may reveal something about overall health that body weight or appearance alone cannot show.
A large 2026 study published in JAMA Network Open examined whether objectively measured physical fitness was associated with the risk of death among adults aged 65 and older.
The researchers looked at several different aspects of fitness rather than treating fitness as a single number. Participants were assessed for cardiovascular endurance, muscular strength, flexibility, balance, and agility.
The results showed that better performance was associated with lower all-cause mortality during follow-up, with particularly strong associations seen for balance and agility, lower-body strength, and cardiorespiratory fitness. (JAMA Network)
That sounds encouraging, but there is an important distinction.
The study does not prove that passing a fitness test will make you live longer.
Instead, it suggests that physical capability may be a useful indicator of how well the body is functioning as people age.
What Did the Researchers Actually Study?
The study included 13,423 adults aged 65 years or older who completed standardized physical-fitness assessments in Taiwan between January 2015 and November 2016.
Participants had an average age of about 73 years, and approximately 63% were women. Researchers then linked their fitness information with health and mortality records and followed outcomes for a median of about seven years. (JAMA Network)
Rather than relying only on questionnaires asking whether someone was active, researchers used physical tests to measure different components of fitness.
The assessments covered four broad areas:
Cardiorespiratory fitness
Muscular strength
Flexibility
Balance and agility
This matters because two people can both describe themselves as "active" while having very different physical abilities.
One person might walk regularly but struggle to stand from a chair.
Another might have strong legs but poor balance.
A third might have good strength but become tired quickly during sustained activity.
The study attempted to capture these differences objectively.
1. Balance and Agility
Balance and agility showed some of the strongest associations with mortality in the study.
Participants completed a one-leg standing test and an 8-foot up-and-go test.
The up-and-go assessment involved standing from a chair, walking around a marker, returning to the chair, and sitting down again.
These movements may look simple, but they combine several abilities that are important in everyday life.
You need to:
Stand up efficiently
Control your body while walking
Change direction
Maintain stability
Sit down safely
The highest-performing group on the 8-foot up-and-go test had an adjusted hazard ratio of 0.41 compared with the lowest-performing group. For the one-leg stance test, the corresponding adjusted hazard ratio was 0.50. (JAMA Network)
These numbers describe an association within this particular study population. They should not be interpreted as an individual's personal probability of survival.
Why might balance matter?
Good balance can contribute to safer movement.
As people age, falls can become more consequential because injuries can lead to hospitalization, reduced mobility, loss of independence, and prolonged recovery.
That is one reason functional fitness deserves attention even when someone does not consider themselves an "athlete."
2. Lower-Body Strength
The researchers also evaluated muscular strength using a 30-second chair-stand test.
Participants repeatedly rose from a seated position without using their arms.
This is a remarkably practical movement.
Standing from a chair involves the hips and legs, but it also requires coordination and control.
The highest-performing group on the chair-stand assessment had an adjusted hazard ratio of 0.55 compared with the lowest-performing group. (JAMA Network)
The finding does not mean that doing chair stands guarantees a longer life.
Instead, it reinforces the idea that lower-body strength is an important component of functional capacity.
Think about ordinary activities:
Getting out of bed
Standing from a chair
Climbing stairs
Getting into a car
Carrying groceries
Walking outdoors
Recovering after losing balance
Many of these activities depend heavily on the legs and hips.
This is one reason resistance training can remain valuable well beyond middle age.
For readers interested in this topic, BrightSocialLife already has a related guide on [what happens when you start strength training after 50]. Start Strength Training After 50
3. Cardiorespiratory Fitness
The third major area was cardiorespiratory fitness.
Researchers assessed this using a two-minute step test. Participants stood in place and repeatedly lifted their knees to a standardized height.
The highest-performing group had an adjusted hazard ratio of 0.58 compared with the lowest-performing group. (JAMA Network)
Cardiorespiratory fitness describes how effectively the body can deliver and use oxygen during physical activity.
You do not have to become a long-distance runner to work on this ability.
Depending on a person's health and physical capacity, activities such as walking, cycling, swimming, or dancing can provide aerobic exercise.
The important point is that cardiovascular fitness is only one part of the picture.
Someone may have good endurance but poor balance.
Another person may have strong legs but limited cardiovascular capacity.
Healthy aging involves maintaining several aspects of physical function rather than chasing one perfect measurement.
4. Flexibility Still Matters
Flexibility was the fourth fitness domain examined.
Researchers used assessments including a back-scratch test and a chair sit-and-reach test.
The study found associations between flexibility performance and mortality, but the strongest associations among the individual tests were observed for balance and agility, lower-body strength, and cardiorespiratory fitness. (JAMA Network)
That distinction is important.
The findings do not mean flexibility is unimportant.
Rather, they demonstrate that physical fitness is multidimensional.
Being able to touch your toes does not tell the whole story about how well you are aging.
Neither does your ability to lift a certain amount of weight.
A more useful picture includes strength, endurance, mobility, balance, and the ability to perform ordinary tasks.
What the Study Does — and Does Not — Prove
This is probably the most important part of the research.
The study was a cohort observational study.
Researchers observed relationships between physical-fitness performance and subsequent mortality.
They did not randomly assign participants to different exercise programs and then determine whether a particular fitness improvement caused longer life.
Therefore, the results cannot establish cause and effect. (JAMA Network)
For example, people who performed better on physical tests may have differed from poorer-performing participants in other ways.
They may have had different levels of underlying health, socioeconomic circumstances, previous activity, or other characteristics.
The researchers adjusted for several factors, including sociodemographic characteristics, comorbidities, body mass index, and self-reported physical activity, but statistical adjustment cannot eliminate every possible source of confounding. (JAMA Network)
The researchers also assessed fitness at a particular point in time rather than continuously tracking changes in physical ability throughout aging.
So the findings should be viewed as evidence that physical fitness is associated with health outcomes, rather than proof that a particular test determines how long someone will live.
Should You Perform These Tests at Home?
Not necessarily.
The assessments used in the research were standardized tests administered under controlled conditions.
Trying to reproduce them at home does not turn them into a medical screening tool.
For someone who is healthy, steady, and accustomed to physical activity, simple functional movements can be useful as personal benchmarks.
But safety comes first.
Anyone with a history of falls, significant balance problems, unexplained dizziness, substantial pain, a recent injury, or a medical condition that affects exercise safety should discuss appropriate activity with a healthcare professional before attempting challenging or timed tests.
There is no benefit to risking a fall simply to obtain a fitness score.
A More Useful Question Than "Do I Look Fit?"
Fitness is often discussed in terms of appearance.
But aging changes the priorities.
A person may have a healthy body weight and still have poor balance or limited functional strength.
Another person may not look particularly athletic but may have excellent endurance and mobility.
Instead of asking only:
"Do I look fit?"
Consider asking:
"Can I comfortably do the things I need and want to do?"
Can you get up from a chair?
Can you climb a flight of stairs?
Can you carry groceries?
Can you walk without becoming unusually exhausted?
Can you turn and change direction safely?
Can you maintain your balance?
Can you get down to the floor and back up safely if your daily life requires it?
These questions are much closer to the concept of functional fitness.
How to Build a Broader Fitness Base After 65
The study does not prescribe a specific exercise program.
However, its findings provide a useful reminder that older adults should not focus exclusively on one form of exercise.
A well-rounded routine can include several components.
Strength training
Resistance exercises can help maintain muscular strength and physical function.
This might involve bodyweight movements, resistance bands, machines, or free weights depending on ability and experience.
Aerobic activity
Walking, cycling, swimming, dancing, and other aerobic activities can help maintain cardiorespiratory fitness.
Balance practice
Balance-focused activities can help challenge stability and coordination.
Mobility and flexibility
Gentle mobility exercises can help maintain the range of motion required for everyday activities.
The appropriate combination and intensity depend on an individual's health, physical capacity, and experience.
For readers looking for practical strength ideas, BrightSocialLife also has guides covering dumbbell exercises after 50 and daily movement for healthy aging. Build Strength After 50 With Dumbbell Exercises How Daily Movement Can Support Healthy Aging After 40
What This Research Means for Everyday Aging
The biggest lesson is not that everyone over 65 needs to pass seven fitness tests.
It is that physical capability deserves attention as we age.
Strength, balance, endurance, and mobility affect how easily people can perform ordinary tasks and maintain independence.
The study provides evidence that these capabilities are also associated with mortality outcomes in older adults.
But the research should not be turned into a prediction tool.
A lower test score does not mean someone is destined to experience poor health.
Likewise, a high score does not guarantee a long life.
Fitness is one part of a much larger picture that includes genetics, medical conditions, nutrition, physical activity, sleep, social circumstances, healthcare access, and many other factors.
The Bottom Line
A large study of more than 13,000 adults aged 65 and older found that stronger performance across several areas of physical fitness was associated with lower all-cause mortality over a median seven-year follow-up.
The strongest associations among individual fitness measures were seen with balance and agility, lower-body strength, and cardiorespiratory fitness. (JAMA Network)
The research does not prove that improving one particular fitness test will extend your lifespan.
What it does provide is another reason to think about healthy aging in terms of function, not just appearance.
Being able to walk, stand, climb, carry, balance, and participate in everyday activities is a meaningful part of staying independent.
The goal isn't to compete with younger people.
It is to maintain as much physical capability as possible for the life you want to keep living.
Medical Disclaimer
This article is for general educational purposes only and does not provide individualized medical advice. Health and exercise decisions should be discussed with a qualified healthcare professional, particularly if you have a medical condition, recent injury, significant balance problems, persistent pain, or concerns about starting a new exercise program.
Sources
Liang L-L, Hsu C-T, et al. Physical Fitness and All-Cause Mortality in Older Adults. JAMA Network Open. Published August 10, 2026. doi:10.1001/jamanetworkopen.2026.28227. (JAMA Network)
JAMA. Physical Fitness Assessments Could Help Guide Older Adult Care. Published August 28, 2026. (JAMA Network)
Health. Study Finds These 4 Areas of Fitness Are Linked to Living Longer After 65. September 13, 2026. (HEALTH)
Suggested Internal Links
Fitness tests after 40 → 5 Fitness Tests That Reveal How Fit You Really Are After 40
Strength training after 50 → What Happens When You Start Strength Training After 50?
Dumbbell exercises after 50 → Build Strength After 50 With 11 Dumbbell Exercises
Daily movement and healthy aging → How Daily Movement Can Support Healthy Aging After 40
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