What the Research Actually Says About Building Bone Density (And What Your Doctor Probably Forgot Tell You)
Here's the conversation I had with my mom - the research, what it actually means, and what to do about it.
There are two specific, well-researched, time-efficient interventions that genuinely build bone. Which one to prioritize first depends on what decade of life you're in.
Less than an hour a week of the right thing can substantially shift your trajectory.
The research on what builds bone is actually really clear. But what the research says and what most women think it means are not the same thing.
What does NOT meaningfully build bone density
This is the part most women don't get told, so let me say it plainly. The following activities, despite being good for plenty of other reasons, have not been shown to meaningfully improve bone mineral density in the research:
Walking (even brisk walking)
Treadmill walking with a weighted vest
Running
Cycling
Swimming
Light dumbbell work (your 5- to 10-pound weights at home)
Yoga and Pilates as typically practiced
These activities are still worth your time. They support cardiovascular health, mood, balance, health and strength in a general way. But if your goal is to actively shift your bone density numbers, they are not the lever.
Bone responds to two things: heavy load and high-rate impact. That's it.
If the exercise isn't heavy enough or rapid enough to challenge the bone, the bone has no reason to adapt. It's a use-it-or-lose-it tissue, and it specifically responds to forces that exceed what it normally encounters.
The two interventions that actually work
Here's where the recommendations diverge based on where you are in your hormonal life.
If you're postmenopausal: heavy resistance training is the most well-researched, most effective intervention for improving your bone health. Jumping is still beneficial - for power, for fall prevention, for staying explosive - but the heavy lifting is doing more of the bone-building work.
If you're premenopausal: you have more options. Both heavy resistance training and a specific style of jumping have been shown to build bone in your decade. This is your window — bone responds more readily to loading before menopause than after, so getting started now pays compounding dividends.
Let me walk you through both.
For postmenopausal women: heavy resistance training
Here's a study I love because the protocol is so accessible. Mosti and colleagues took postmenopausal women with osteopenia or osteoporosis and put them through a 12-week heavy lifting protocol on a hack squat machine.
The hack squat machine is the unsung hero here. Most gyms have it. You sit (or stand depending on the model) under a load that pushes down through your shoulders — which is exactly what your spine and hip need to feel — but the machine controls the bar path for you. No barbell to balance, no spotter required, no years of technique mastery to access the benefit. If you've never done heavy strength work before, this is one of the most approachable entry points there is.
The protocol:
3 sets of 5 reps
3 times per week
Lower the weight slowly, drive up as fast as possible
3 to 5 minute rest between sets
The weight should be heavy. By the fifth rep of each set, you should be thinking thank goodness this set is over.
Total time per session, including rest: about 20 minutes. Three sessions a week. That's an hour a week, total.
A note on the rest periods: these matter. Taking a long rest is what allows you to lift heavy on the next set, which is what creates the bone signal. If you compress the rest, you'll have to drop the weight, and you'll get a different (less effective) training stimulus. The rest isn't wasted time — it's part of the protocol.
After 12 weeks of this protocol, the women in the training group saw:
2.4% increase in lumbar spine bone mineral content
4.5% increase in femoral neck bone mineral content
154% increase in maximum strength
52% increase in rate of force development (the neuromuscular speed quality that determines whether you can catch yourself when you trip)
Meanwhile, the control group — women who didn't train — lost 3.3% of their total hip bone mineral content over the same 12 weeks.
Note: the study measured bone mineral content (the total amount of bone material) rather than bone mineral density (the number on a DEXA scan). Another study (LIFTMOR) used heavier barbell-based lifting over 8 months. This showed clear bone mineral density (BMD) improvements.
What this means: If you can lift with a barbell, do that. If you can’t (either due to shoulder pain or not feeling safe with a barbell), use the hack squat machine.
If you've never lifted heavy before, don't start at "as heavy as possible." Start with light weight your first session — just to learn the machine. Then progress over the next two to three weeks until you're at a load where five reps genuinely feels hard. That's the working weight.
This is the single most powerful thing a postmenopausal woman can do in an hour a week to change her bone trajectory.
For premenopausal women: a small, specific style of jumping
If you're premenopausal, you can use a different optio. Your bones are more responsive right now than they will be later, and you can get a real signal with very little equipment and very little time.
A study by Bassey and Ramsdale took premenopausal women in their early 30s and had them do a simple home protocol: 50 two-legged jumps a day, barefoot, landing softly on the toes with bent knees. The jumps were small — about 2 to 4 inches off the ground — producing roughly 2x body weight of force on landing.
That's it. 50 small jumps a day at home.
After 6 months, the jumping group had a 3.4% increase in trochanteric (hip) bone density.
When the women who hadn't been jumping crossed over and started jumping, they gained 4.1% in the next 6 months. The original group held their gains.
Important details:
Jumps are small. Not maximum effort, not box jumps, not anything that should feel athletic or intimidating. Two to four inches off the floor is plenty.
Land softly. Toes first, knees bend, absorb. This is gentler on your joints than walking, actually.
Barefoot. This was part of the study protocol. The neural input matters.
Daily. Bone responds to consistent, repeated signals, not to occasional heroic efforts.
Two to three minutes a day. That's the dose.
You can stack this onto an existing strength routine, or do it as a standalone — the research supports either. The bone response in this study happened in women who weren't otherwise doing high-impact training.
What about perimenopausal women?
Honestly? The research is thin here. Most studies separate women into pre- and postmenopausal categories and the messy in-between window doesn't get its own dedicated literature.
My clinical read: if you're early in perimenopause and still cycling regularly, the premenopausal data probably still applies. As estrogen shifts more dramatically, the postmenopausal protocols become more relevant. The smartest move during the transition is to add the heavy lifting before you need it — so your body is already adapted by the time the hormonal landscape changes more dramatically.
Don't wait for your DEXA to change. Build the foundation now.
What about jumping after menopause?
Jumping alone hasn't been shown in RCTs to build BMD in postmenopausal women the way it does premenopausally.
But — and this matters — jumping after menopause is still really worth doing.
Why? Because power and explosiveness are independent predictors of fracture risk in older adults. Loss of power precedes loss of strength as we age, and power is what determines whether you can catch yourself when you trip, recover from a stumble, or move quickly when something jumps in front of you on the sidewalk.
The fracture-prevention story for postmenopausal jumping isn't about BMD anymore. It's about staying neuromuscularly capable. Both matter.
So if you're postmenopausal: heavy resistance training is the bone-building lever. Jumping stays in the program because it keeps you explosive, balanced, and quick — which is doing different fracture-prevention work.
Where to start this week
If you read this far and you want to actually do something with it, here's the simplest possible starting point:
If you're postmenopausal and have access to a gym: find the hack squat machine. Spend a session getting comfortable with it at a light weight. Build up over two to three weeks to a load where 5 reps feels hard. Three sessions a week, 20 minutes each.
If you're premenopausal: start with 50 small two-legged jumps in the morning, barefoot, landing soft. That's it. Add heavy strength work over time.
If you're in pain or unsure where to start: that's the gap I work in. Hit reply on the email or send me a message - tell me where you are with all of this. Where you've been, what's gotten in the way, what hurts, what you're scared of. I read everything.
You don't need to figure this out alone.
Cheering you on, Chelsea
Chelsea Matthews - Doctor of Physical Therapy, Running Specialist and Coach
Dr. Chelsea Matthews is a Doctor of Physical Therapy with 11 years of clinical experience. She works with active adults looking for guidance that is evidence-informed and built around their goals.
References
Bassey EJ, Ramsdale SJ. Increase in femoral bone density in young women following high-impact exercise. Osteoporos Int. 1994;4(2):72-75.
Mosti MP, Kaehler N, Stunes AK, Hoff J, Syversen U. Maximal strength training in postmenopausal women with osteoporosis or osteopenia. J Strength Cond Res. 2013;27(10):2879-2886.
Watson SL, Weeks BK, Weis LJ, Harding AT, Horan SA, Beck BR. High-Intensity Resistance and Impact Training Improves Bone Mineral Density and Physical Function in Postmenopausal Women With Osteopenia and Osteoporosis: The LIFTMOR Randomized Controlled Trial. J Bone Miner Res. 2018;33(2):211-220.
