I often see older people walking in Karachi early in the morning. Some move briskly around a park. Others walk slowly along a neighbourhood road before the traffic becomes unbearable.
It looks like exactly what doctors have been telling us to do for years: keep moving.
But there is a question we rarely ask. Is walking enough to protect our bones as we grow older?
The answer is more complicated than I once thought.
Physical activity remains one of the most useful tools we have for healthy ageing. Yet current evidence shows that bones do not respond equally to every type of movement. Walking helps. Strength training can provide a different stimulus. Balance exercises matter for another reason entirely: they may stop the fall that causes the fracture.
For older adults, therefore, the important question is no longer simply whether we exercise.
It is what kind of exercise we do.
What Happens to Our Bones as We Age?
Bone looks permanent, but biologically it is active tissue.
Throughout life, the body continuously removes old bone and forms new bone. With ageing, particularly after menopause in women, bone breakdown can outpace bone formation. Bone mineral density may decline, and the skeleton can become more vulnerable to fractures.
Ageing also affects muscle.
That combination matters. Weaker bones increase the consequences of a fall, while weaker muscles and poorer balance can increase the chance of falling in the first place.
This is why exercise has more than one role in protecting an older person.
According to the U.S. National Institute of Arthritis and Musculoskeletal and Skin Diseases, physical activity can support bone health while also improving muscle strength, coordination and balance.
The last two benefits deserve more attention than they usually receive.
A stronger hip is useful.
Not falling on that hip may be even more useful.
Exercise Cannot Turn an Older Skeleton Back into a Young One
Health articles sometimes exaggerate what exercise can achieve.
The claim that exercise simply “builds strong bones” needs qualification when we talk about older adults.
Exercise during childhood and early adulthood helps build bone mass. Later in life, the objective changes. The NIAMS guidance on osteoporosis explains that exercise in older adults is particularly valuable for maintaining function, improving strength and balance, and limiting the consequences of age-related decline.
Changes in bone mineral density from exercise can be modest.
That does not make exercise ineffective.
Recent systematic reviews and meta-analyses show that resistance-training effects vary according to exercise intensity, frequency and the skeletal site being measured. Some programmes produce measurable improvements, while differences at other sites are less certain.
The research also illustrates why simple statements such as “lifting weights increases bone density” can mislead readers.
The response depends on the programme and the person.
Walking Is Excellent, but Walking Alone May Not Be Enough
This point deserves special attention because walking is probably the most accessible exercise for older adults.
Walking has many advantages. It keeps us mobile. Brisk walking counts as weight-bearing activity, and it supports cardiovascular fitness and independence.
I would never tell an older person who has started walking that the activity is unimportant.
But walking should not automatically become the entire bone-health programme.
Bones respond to mechanical loading. Different activities impose different forces on the skeleton. Ordinary walking generally creates less skeletal stimulus than appropriately designed resistance or impact exercise.
The Royal Osteoporosis Society recommends combining impact activity with strength exercise when this is appropriate for the individual.
So a daily walk remains valuable.
The better question is what can safely accompany it.
Strength Training Becomes Increasingly Important
This is where the evidence becomes particularly useful.
Resistance training means making muscles work against resistance. That resistance does not have to come from a barbell in a gym.
It can come from dumbbells or resistance bands. Body weight can also provide resistance.
When muscles contract against resistance, they place forces on bones. The body can respond to this mechanical loading.
The Royal Osteoporosis Society’s strength-exercise guidance recommends strength exercise two or three days a week for people who can perform it safely, with appropriate progression and technique.
Research continues to refine exactly how hard older adults need to train.
Recent systematic reviews comparing resistance-training programmes suggest that greater intensity can improve strength, but bone-density responses are not identical at every skeletal site. That is a useful warning against turning “heavier is better” into another simplistic rule.
The goal is not to make every 70-year-old lift the heaviest weight possible.
The goal is to provide an appropriate and progressive stimulus.
What About Jogging, Jumping and Other Impact Exercise?
Here we need caution.
Impact exercise produces forces through the skeleton. Depending on the person, activities involving greater impact may provide a useful bone stimulus.
But this does not mean every older adult should start jogging or jumping.
The Royal Osteoporosis Society classifies walking and stair climbing as relatively low-impact activities. Jogging, small jumps and some forms of dancing create greater impact.
Its guidance makes an important distinction. Moderate-impact activity may benefit bones, but high-impact exercise is not specifically required for people with osteoporosis. Someone who already performs higher-impact activity comfortably may be in a different situation from an older person with spinal fractures who suddenly decides to start jumping.
Medical history changes the equation.
A person with osteoporosis, previous fragility fractures, painful arthritis or significant balance problems may need a modified programme.
This is precisely why an exercise that is good for one 65-year-old may be unsuitable for another.
Stronger Bones Are Only Half the Story
Imagine two older adults with similar bone density.
One has strong legs and good balance. The other struggles when rising from a chair and becomes unstable when turning quickly.
Their fracture risks are not necessarily identical.
Many fractures occur after falls. Preventing the fall therefore becomes part of protecting the skeleton.
The NIAMS exercise guidance specifically recommends balance training for older adults.
Balance work can take several forms. Tai chi is one example. Carefully performed step-ups and weight-shifting exercises are others.
The purpose is practical.
An older person who can recover after stumbling over a doorstep may avoid the event that would otherwise produce a hip fracture.
Exercise therefore protects us through two different mechanisms.
Some activities load the skeleton and help preserve bone strength. Others improve the muscles, coordination and balance that help keep us upright.
A good programme considers both.
Bone Density Is Not the Whole Measure of Success
This also changes how we should interpret research.
Bone mineral density, usually measured by a DXA scan, is an important marker of osteoporosis and fracture risk. But it does not capture every benefit of exercise.
Suppose an older person’s DXA result changes very little after months of exercise.
Was the programme useless?
Not necessarily.
If that person has stronger legs, walks more confidently and can recover balance more effectively, the exercise may still have reduced important contributors to fracture risk.
This distinction explains why relatively modest changes in bone mineral density should not be interpreted as evidence that exercise does little for older adults.
Healthy ageing is not a laboratory number alone.
It is also the ability to stand, walk and remain independent.
Exercise Does Not Replace Osteoporosis Treatment
Another correction is necessary.
Exercise is sometimes presented online as a natural alternative to osteoporosis medication.
The evidence does not support that claim.
The Royal Osteoporosis Society states that exercise and healthy habits do not replace osteoporosis medicine when medication is clinically indicated.
Someone at high risk of fracture may need medical treatment in addition to exercise.
Nutrition matters as well. Adequate calcium, vitamin D and protein form part of the wider picture, depending on individual dietary intake and medical circumstances.
Exercise belongs inside that framework.
It should not be sold as a cure.
Who Should Be Particularly Careful?
Most older adults can benefit from becoming more active, but the starting point matters.
A healthy 65-year-old who already walks several kilometres and has good balance is not in the same position as an 80-year-old with vertebral fractures.
The Royal Osteoporosis Society’s safety guidance recommends seeking professional advice when someone has spinal fractures, multiple previous fractures, recurrent falls or medical problems that make exercise difficult.
People who have been inactive should also progress gradually.
Technique matters during resistance exercise. So does balance before attempting more demanding impact movements.
Pain, severe breathlessness, dizziness or chest symptoms during exercise should not simply be ignored in the hope of becoming fitter.
Age should not frighten us away from movement.
Medical circumstances should shape how we move.
So What Should an Older Adult Actually Do?
I would resist the temptation to prescribe one universal routine.
The evidence instead points toward a combination.
Regular walking or another suitable aerobic activity can keep a person moving. Progressive resistance exercise can challenge muscles and bones more directly. Balance work can reduce one of the major pathways to fracture: falling.
The precise intensity must depend on fitness, bone health and previous fractures.
This approach is less dramatic than promising that one exercise will rebuild ageing bones.
It is also much closer to the evidence.
The Question Has Changed for Me
When I see older people walking in the morning now, I still regard that habit as something worth protecting.
Getting out of the chair matters.
Walking matters.
But our understanding of bone health should move beyond the advice to “stay active.”
An ageing skeleton needs appropriate loading. An ageing body also needs enough muscle and balance to avoid the fall that can turn low bone density into a broken hip.
Physical activity cannot stop ageing.
It can, however, change how we age.
For many older adults, the most useful programme may therefore be neither endless walking nor aggressive gym training. It is a carefully chosen combination of movement, resistance and balance, adjusted as the body changes.
And when osteoporosis or previous fractures enter the picture, the exercise should adapt with them.
Medical note: This article provides general health information and does not replace individual medical advice. People with osteoporosis, previous fragility or spinal fractures, recurrent falls, significant joint disease, or other medical conditions should discuss new or substantially more intensive exercise with an appropriate healthcare professional.