Bone Density: The Health Metric You Can’t See Until It Becomes a Problem

TTG Staff
Jul 30
8 min read

Most people do not think about their bone density until a doctor tells them it is low.

That is partly because you cannot see weak bones in the mirror.

You can notice muscle loss. You can feel your fitness declining. You can see your weight changing. Bone loss, however, can continue quietly for years without causing pain or any obvious warning signs.

Then someone receives a diagnosis of osteopenia or osteoporosis and is told to walk more, take some calcium and avoid lifting anything too heavy.

Some of that advice may be well-intended, but it misses an important point:

Bones need a reason to remain strong.

Like muscle, bone responds to the demands placed upon it. If we progressively remove load, impact and physical challenge from someone’s life, we should not be surprised when their body becomes less prepared to tolerate them.

This does not mean everyone with low bone density should immediately start lifting heavy weights or jumping. It means the long-term solution should involve gradually rebuilding the physical qualities that protect them, not simply avoiding everything that feels demanding.

Bone Is Living Tissue

We often think of the skeleton as the fixed frame holding the body together, but bone is living tissue. It is constantly being broken down and rebuilt.

During childhood and adolescence, we have an opportunity to build a strong foundation.

Through adulthood, the goal becomes maintaining as much of that strength as possible.

As we get older, particularly after menopause or other hormonal changes, bone breakdown can outpace bone formation.

Age is only one part of the picture. Bone density can also be affected by:

genetics and family history
hormonal changes
low levels of physical activity
inadequate calcium, vitamin D, protein or overall food intake
smoking and excessive alcohol intake
low body weight
some medical conditions and medications
prolonged bed rest or immobilisation; and
previous fractures.

Low bone density is more common in women, but it is not exclusively a women’s health issue. Men can also develop osteopenia and osteoporosis, particularly as they age or when other risk factors are present.

Osteopenia Is a Warning, Not a Fracture

Osteopenia means bone mineral density is lower than expected, but not low enough to meet the diagnostic threshold for osteoporosis.

Osteoporosis means the bones have become less dense and more fragile, increasing the risk of fracture.

Neither diagnosis means a fracture is inevitable.

A scan result is one part of the risk picture. Age, previous fractures, balance, muscle strength, medications, health conditions and the likelihood of falling all matter too.

This distinction is important because the goal should not be to become afraid of movement. It should be to understand the risk, make sensible adjustments and begin improving the factors we can influence.

How Do You Know What Your Bone Density Is?

Bone mineral density is usually measured with a DXA scan, sometimes written as DEXA.

The scan commonly measures the hip and lumbar spine and may provide two different scores:

a T-score, comparing your bone density with that of a healthy young adult; and
a Z-score, comparing it with what is expected for someone of your age and sex.

Your doctor interprets those results alongside your health history and other fracture risk factors.

This is not the same as the estimated bone mass displayed on a body-composition scan.

At The Training Ground, our Tanita system can estimate bone mass as part of a broader body-composition assessment. That can be useful information within its intended context, but it does not directly measure bone mineral density and cannot diagnose osteopenia or osteoporosis.

If repeated scans show your bone mass score is going down, it’s usually a sign to talk to your doctor and consider getting a DXA scan.

If you are genuinely concerned about bone density, a DXA scan is the assessment to discuss with your doctor.

For reference, Tanita provides these guidelines based on gender and body weight.

Female Weight	Healthy BM Weight
Less than 49kg	1.95kg
Between 50kg-75kg	2.4kg
Over 76kg	2.95kg
Male Weight
Less than 64kg	2.65kg
Between 65kg-95kg	3.29kg
Over 95kg	3.69kg

Can Training Improve Bone Density?

Yes, but not all training helps.

Older woman in black workout clothes lifts a kettlebell in a gym while a younger woman watches nearby.

Bones adapt to the forces placed through them. When a muscle contracts, it pulls on the bone to which it is attached. When you support an external weight, the skeleton must tolerate that load. When you land from a hop or jump, the bone experiences a different type of force again.

Those forces provide a signal that the body needs to maintain or strengthen the structures being used.

The important word is progressive.

Doing the same easy exercises with the same light resistance indefinitely is unlikely to keep producing adaptation.

The body needs a challenge that is appropriate now and can gradually increase as strength and confidence improve.

That might eventually include:

squats
deadlifts or other hip-hinge exercises
step-ups, split squats and lunges
loaded carries
pushing and pulling exercises; and
exercises that progressively load the hips and spine.

There is nothing magical about those particular exercises. We use them because they allow us to challenge large muscle groups, apply load through useful movement patterns and progress the demand over time.

A machine, kettlebell, dumbbell, barbell or bodyweight variation can all be appropriate. The best choice is the one the person can perform safely, confidently and with enough challenge to create a reason for adaptation.

Why Walking Alone Is Not a Bone-Density Program

Walking is good for you.

It supports cardiovascular health, helps maintain activity, exposes the body to weight-bearing movement and can reduce the time you spend sitting.

But telling someone with low bone density to “just walk more” is incomplete advice.

The body adapts to familiar demands. If you have been walking for years, another walk over the same distance at the same pace is unlikely to provide a new or particularly strong stimulus to the skeleton.

Walking can remain part of the plan, but it should not necessarily be the entire plan.

Swimming and cycling are similar. They can be excellent forms of cardiovascular exercise, but because the body is supported and there is little impact loading, they do not replace resistance or appropriate weight-bearing exercise for bone health.

This is an important distinction:

An activity can be healthy without training every physical quality you need.

The best program does not ask one form of exercise to do everything. It uses different types of training for different purposes.

What About Impact Exercise?

Impact gives bones a stimulus that strength training alone may not completely reproduce.

Depending on the individual, impact training could include:

depth drops
low-level hops
skipping
jumping
stair climbing
jogging; or
landing and changing direction.

That does not mean more impact is always better.

Someone who is already strong, coordinated and free from major joint problems may tolerate small amounts of impact training quite well.

Someone with osteoporosis, a history of spinal fractures, poor balance or a high risk of falling may need a very different starting point.

We should not treat a jump as universally good or universally dangerous.

We should decide whether it is appropriate for the person in front of us.

For some people, the first step may simply be building stronger legs, learning to decelerate during a step-down and improving confidence on one leg. As their capacity improves, more demanding options may become appropriate.

That is what good progression looks like.

Strong Bones Are Not Enough on Their Own

Improving bone density is useful, but a stronger skeleton is only one part of reducing fracture risk.

We also need to consider what causes many fractures in the first place:

A fall.

Leg strength, balance, coordination and reaction capacity can help someone recover when they trip, manage stairs, step over an obstacle or get themselves safely to the ground.

This is why a good bone-health program should also help a person:

balance on one leg
step confidently in different directions
carry weight while maintaining control
get up and down from the floor
build enough leg strength to catch themselves; and
continue doing the activities that keep them independent.

The purpose of training is not simply to chase a better number on a scan.

It is to build a body that is strong enough to tolerate everyday life and capable enough to respond when something does not go to plan.

Calcium Matters, but It Is Not the Whole Solution

Calcium is an important structural component of bone.

If your diet does not provide enough, the body can draw calcium from the skeleton to support other essential functions.

That does not mean everyone should immediately purchase a calcium supplement.

Dietary requirements vary by age and life stage.

Dairy foods, calcium-fortified alternatives, calcium-set tofu and tinned fish with edible bones can all contribute.

If intake is inadequate, a doctor or dietitian can help determine whether dietary changes or supplementation are appropriate.

Vitamin D also matters because it helps the body absorb calcium and supports normal muscle and bone function.

Sun exposure contributes to vitamin D production, but the amount required varies between people.

A blood test can identify deficiency.

Protein is another part of the equation.

Bone contains a protein framework, while muscle provides much of the force used to load and protect the skeleton.

Preserving muscle becomes increasingly important as we age.

Finally, the body needs enough total energy.

Chronically under-eating while training hard can negatively affect hormones, recovery, muscle and bone.

This can be particularly relevant for people maintaining a very low body weight, repeatedly dieting aggressively or experiencing disrupted menstrual function.

Food supplies the building materials, but training gives the body a reason to use them.

You need both.

Suggested Reading: What Does "Healthy Eating" Mean?

Exercise Does Not Replace Medical Treatment

Strength training is powerful, but it is not a substitute for appropriate medical care.

Some people will need medication to reduce fracture risk.

Others may need further investigation to understand why their bone density is low.

If a medication or health condition is contributing to bone loss, that also needs to be managed with the appropriate healthcare professional.

You should discuss your bone health with your doctor if you:

have experienced a fracture from a minor fall or incident
have been diagnosed with osteopenia or osteoporosis
have a strong family history of osteoporosis or hip fracture
have experienced early menopause or prolonged menstrual disruption
take medication known to affect bone health
have a condition affecting hormones or nutrient absorption
have experienced significant height loss or unexplained spinal pain; or
are concerned about your individual risk.

If you already have osteoporosis, a history of spinal or hip fracture, or a high falls risk, your exercise program should be individually assessed.

That does not necessarily mean you should avoid challenging exercise forever.

It means the exercise selection, starting point and rate of progression need more thought.

Build Capacity Before Fragility Becomes Obvious

Most people wait until something hurts before they take action.

Bone health does not always give you that warning.

You may not feel your bone density changing, but your daily habits are still influencing it.

Every year spent strength training, eating adequately and maintaining physical capability is an investment in what your body will be able to tolerate later.

You do not need to train like a powerlifter.

You do need to give your bones a reason to remain strong.

That means:

applying meaningful resistance
progressing it over time
including appropriate weight-bearing and impact activity
developing strength and balance
supporting training with adequate nutrition; and
seeking medical guidance when risk factors are present.

The goal is not simply to avoid osteoporosis.

The goal is to remain strong enough to carry what you need to carry, stable enough to catch yourself when you stumble, confident enough to keep moving and capable enough to continue living independently.

That is what strength, longevity and capacity for life actually look like.

At The Training Ground, we help people start at the level that is appropriate for them and build from there.

If you have been diagnosed with low bone density, are returning to exercise or want a structured strength program for your long-term health, speak with our coaching team about an appropriate starting point.

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