Is Your Strength Training Program Actually Improving Your Bone Density?
Most GROUP EXERCISE Workouts Aren’t Designed for Bone Density
A lot of women assume that if they are lifting weights, they are improving their bone health.
That is not always true.
You can work out consistently, feel strong, and still not be giving your bones the stimulus they need to actually change.
Bone density does not improve from just moving more or doing resistance training in a general sense. It improves from specific types of stress.
That is where most programs fall short.
What the Research Actually Shows
A recent study called the LIFTMOR trial looked at 101 postmenopausal women with low bone density. The women were split into two groups:
Low-Intensity Group
This group followed a structured home program that included:
Light resistance work with bands or bodyweight
Higher-rep, low-load strength exercises with dumbbells
Balance and posture work
Mobility-focused movements
No heavy lifting
No impact training
They were consistent and doing what most people would consider a solid fitness routine.
High-Intensity Group
This group trained 2 times per week for about 30 minutes, with supervision.
Their program included:
Barbell deadlifts
Barbell back squats
Overhead presses
Controlled impact work like jump or drop landings
The structure was simple:
5 sets of 5 reps
Around 80 to 85 percent of their max
Full rest between sets
Gradually increasing weight over time
This was not a fast-paced program and they often did less total “movements” than the low impact group. The goal was to lift heavy with good form and continue progressing.
The Results
After 8 months, the difference between the two groups was not small.
The women lifting heavy increased bone density at the spine by about 2.9%.
The low-intensity group lost about 1.2% in the same area.
That is roughly a 4% difference between groups in less than a year.
For context, postmenopausal women typically lose around 1–2% of bone density per year without intervention.
So this was not just “slowing bone loss.”
It was:
Reversing it in one group
While the other group followed the expected decline
At the hip (which is one of the highest risk areas for fractures), the lifting group maintained or slightly improved bone density, while the low-intensity group declined.
That alone is significant. Preventing loss at the hip can directly impact long-term fracture risk.
It Wasn’t Just Bone Density
The high-intensity group also saw:
Large increases in strength
Improvements in functional capacity
Better performance in things like lifting, carrying, and general movement
This matters because fracture risk is not just about bone density.
It is also about:
Strength
Balance
Ability to catch yourself and move well
So the same program that improved bone density also made these women stronger and more capable overall.
Why This Is a Big Deal
A ~3% increase in bone density might not sound dramatic at first.
But in this population, it is.
Most interventions, including many medications, aim to slow loss, not necessarily increase bone density in a meaningful way.
Seeing:
A measurable increase
In under a year
From just 2 short sessions per week
is what makes this study stand out.
Where Most Programs Miss the Mark
A lot of programs are built around movement variability and density, not progression.
You see:
Constantly changing workouts
Completing MANY movements in a single session, instead of continuing to practice the main barbell lifts
Avoidance of barbell lifts, which are proven to be more effective at building bones
Working with limited equipment for certain exercises due to spacing and/or equipment limitations
These workouts can feel productive and be very fun. But if the load is not increasing over time, your bones are not getting a reason to adapt.
This is how someone can work out for years and still lose bone density!
What a Bone-Building Program Actually Looks Like
If improving bone density is a goal, your program should include:
1. Progressive Overload
You need a clear plan to gradually increase weight over time. This is the foundation of both muscle and bone adaptation.
2. Moderate to Heavy Loads
This does not mean maximal lifting every session. But it does mean regularly working in ranges that feel challenging and require focus, often close to failure.
3. Compound Barbell Movements
Exercises like squats, deadlifts, and presses create the kind of full-body loading that bones respond to best.
4. Consistency Over Time
Bone adaptation is slow. You are not going to see changes in a few weeks. This is a long-term investment.
5. Good Coaching and Technique
The LIFTMOR study was fully supervised. That matters. Learning how to lift well is what allows you to lift heavier safely over time.
What This Does Not Mean
You do not need to jump straight into heavy lifting.
You do not need every workout to feel intense in the traditional sense.
And lighter training still has a place.
But if your goal is stronger bones, your program needs to include periods where you are actually lifting heavier over long periods of time.
How We Approach This at Iron and Mettle
At Iron and Mettle, we build our programs around progressive overload and structured strength cycles.
That means:
You are not guessing what weight to use (we track it for you!)
You are not repeating the same weights every week
You understand RPE (rate of perceived exertion) and how to apply it to every lift
You are building toward heavier loads over time, using barbell lifts in a controlled and coached environment.
The goal is not just to make workouts feel hard - but to make sure the effort you are putting in the gym is working towards better longevity and bone health.
The Bottom Line
Not all strength training improves bone density.
If your workouts are not getting heavier over time, they are likely not creating the stimulus your bones need.
The goal is not just to move - but it’s to drive adaptations in your muscles AND your bones! That requires tracking your workouts over time, making sure you are increasing load safely, and having a coach to help guide you along the way. At Iron and Mettle we care about our clients long-term health and help them learn the importance of weight lifting each and every day!
To learn more:
Check out our personal training options
Read our blog on Progressive Overload
Link to the LIFTMOR study mentioned here: