APEX PWR  |  Lessons in Longevity

Bone Is Living Tissue. It Keeps What You Make It Earn.

Most people picture the skeleton as scaffolding. Inert, finished, holding everything else up, quietly wearing out on a schedule nobody controls.

That picture is wrong in a way that matters. Bone is one of the most metabolically busy tissues in your body. It is being demolished and rebuilt constantly by two cell populations working against each other, and the referee in that fight is mechanical load. Stress the tissue and the rebuilding side gets a reason to keep up. Remove the stress and your body draws the obvious conclusion, which is that it is maintaining something you are not using.

We have treated bone loss culturally as a tax on getting older. Something that happens to you, that you find out about after a wrist fracture in a parking lot. It is a lot more responsive than that.

What the New Research Actually Found

On September 21, 2026, the BMJ published the largest analysis of this question to date. Researchers pooled 124 randomized controlled trials covering 18,429 adults aged 40 and older and asked a straightforward question: does structured exercise change bone mineral density, and if so, how much of it do you need?

The answer was yes, with real qualifiers. Structured exercise produced what the authors described as a modest but clinically meaningful mitigation of age-related decline in bone mineral density at the lumbar spine, the femoral neck and the total hip. In plain terms, exercise did not turn a 55-year-old skeleton into a 30-year-old one. It meaningfully slowed the slide, and in places nudged it back.

Two findings deserve to be stated plainly, including the one that is inconvenient for a gym to report.

1. The dose is lower than you would guess

Benefits started showing up at around 600 MET-minutes per week. A MET-minute is just a unit of exercise volume: intensity multiplied by time. Six hundred of them is roughly two to three hours of brisk walking spread across a week. That is the threshold where the effect became visible, not the ceiling.

That number should be encouraging to anyone who has been told they need to overhaul their life. The entry price for defending your skeleton is two to three hours a week, and it does not have to start in a squat rack.

2. Walking and jogging ranked first, not lifting

This is the part a fitness facility is tempted to bury, so we will put it in bold. In this analysis, brisk walking and jogging came out on top for bone mineral density. Combined aerobic and resistance training also performed well, but across fewer skeletal sites.

The paper also reported something else worth knowing: effects were more pronounced in middle-aged people and in people with a healthy BMI, and blunted in older adults and in people with overweight or obesity. That is a real limitation, and if you are in one of those groups it is a reason to start sooner and expect a slower curve, not a reason to skip it.

Why "Just Walk" Is an Incomplete Answer

Bone mineral density is one outcome. It is a good one, it is the one every trial measures, and it is not the thing you are actually trying to prevent.

What you are trying to prevent is a broken hip at 74, and that event has two inputs. How strong the bone is, and how hard the ground hits it. Bone density research only speaks to the first. Muscle mass, leg strength, balance and reaction time decide the second, and none of those show up on a BMD readout.

There is also a specificity problem that gets lost in headlines, and it is the single most useful thing in this article.

Bone only adapts where it gets loaded

A 2024 modeling study examined what different activities do to hip contact force compared with ordinary walking. The results were counterintuitive enough that they changed how we program.

Read that first row again. The two-footed jumping protocol that circulates every January as a bone-building hack is, by this modeling, less hip loading than a walk. When you land on two legs, you split the force and absorb it symmetrically. When you land on one, the hip has to take the whole thing and stabilize against it sideways, which is the input bone responds to.

And the spine is a separate problem entirely. Multiple analyses agree that jumping of any kind does very little for lumbar spine bone density. The spine responds to heavy axial load, which means a bar on your back. The LIFTMOR trial is the cleanest demonstration: heavy resistance training at above 80 to 85 percent of a one-rep max, five sets of five, produced roughly a 2.9 percent gain in lumbar spine bone density against a 1.2 percent loss in the control group.

This is also why we are updating our own older content. We have a post on this site recommending ten minutes a day of jumping for bone density that predates the bilateral-versus-unilateral finding. It is on our list to correct. We would rather be publicly wrong and fix it than quietly leave it up.

Now the Part Almost Nobody Explains: Your Body Comp Scan Is Not a Bone Density Scan

We have been running DEXA scans since 2016, and this is the most common and most consequential misunderstanding we run into.

A whole-body body composition DEXA does produce a total body bone density number. People see it, see that it looks fine, and reasonably conclude they have had their bones checked.

They have not, and there is good evidence for why that matters.

A study of 699 adults compared whole-body regional bone density against dedicated site-specific scans. At the group level the agreement was strong, with the spine correlating at r² 0.92 and the hip at r² 0.72. But the authors found the two approaches disagreed about the status of individual people, and specifically that the whole-body method under-called osteoporosis at the femoral neck.

The femoral neck is the site that breaks. It is the fracture that costs people their independence.

Worth knowing too: site-to-site disagreement is normal even between dedicated scans. Published rates put minor discordance between spine and hip at 39 to 44 percent and major discordance at roughly 3 to 5 percent. Bones in the same body are not on the same schedule. That is exactly why the diagnostic standard scans multiple sites directly instead of averaging your whole skeleton into one number.

The two scans, side by side

Physician Reviewed, Without a Separate Doctor's Appointment

This is the piece we think people undervalue until they have sat with a result they do not understand.

A T-score and a Z-score are two different comparisons and they answer two different questions. The T-score compares you against young-adult peak bone mass, and it is what the osteopenia and osteoporosis categories are defined on. The Z-score compares you against people your own age and sex. Near peak bone mass those two numbers sit close together. By 60 they can be roughly two standard deviations apart, which means the same scan can look alarming or unremarkable depending on which number somebody reads you.

Getting that wrong in either direction has a cost. A frightened 42-year-old who did not need to be frightened, or a real finding that nobody acted on.

So at APEX, bone density scans are interpreted by our licensed team and reviewed by Dr. Jordan Senn, the physician on our wellness team. That review is included. No second appointment, no second fee, no waiting on a referral to get a clinician's eyes on your own numbers.

The most useful thing about having a physician inside the building is not the dramatic finding. It is the ordinary one: telling somebody that the number that scared them is within the expected range for their age, and here is what we are going to do about the part that is actually worth attention.

The APEX Wellness Team Tigard, Oregon

Who Should Actually Get a Bone Density Scan

We are not going to tell you everyone needs one, because that is not true and it is the kind of claim that makes testing facilities untrustworthy.

The clearest reasons to book one:

• You are in the menopause transition or postmenopausal, particularly with any additional risk factor.
• You have had a fracture from a fall that should not have broken anything.
• You have a condition or take a medication that affects bone, or you are coming off estrogen therapy.
• Your total body bone density came back low on a body composition scan and you want the sites that matter measured directly.
• You have a family history of osteoporosis or hip fracture.
• You are an athlete, or formerly one, with a history of stress fractures or long stretches of low energy availability.

There is also an honest case for an elective baseline for healthy women in their late 30s and 40s with none of the above, and we will state the case and its limits together. No guideline recommends scanning at that age. A low result at 38 would not put you on medication, because osteoporosis drugs are not indicated or well studied in healthy premenopausal women. What it would change is how we train you, and it gives you a real starting line to measure the next twenty years against.

The strongest evidence for that is a study following 451 women through the menopause transition, which found that bone density before the transition, and the rate at which it declined, each independently predicted later osteoporosis, and together predicted it about 2.7-fold. A counterweight worth stating: other work in older adults found a repeat scan four years later added little to prediction. The picture is not settled.

What We Do With the Result

A scan is a measurement. On its own it changes nothing. Here is the actual sequence once we have your numbers.

1. Interpretation. Your spine and dual-femur results, T-score and Z-score, reviewed by our physician and explained to you in language you can repeat to your family.
2. Load where it counts. Unilateral impact work for the hip, built gradually over about eight weeks. Supervised heavy axial loading for the spine. Both, because they are different jobs.
3. The nutrition side. Protein, calcium, vitamin D and total energy intake. Under-eating is one of the fastest ways to lose bone and one of the most common things we find. That is our nutrition team's half of this.
4. Retest on the right clock. Bone at twelve months, because a realistic gain is one to three percent and anything sooner is inside the noise of the machine. Body composition every eight to twelve weeks, where the changes are large enough to read.
5. Refer out when it is warranted. If your result belongs with a prescribing physician, we will tell you that plainly.

The training half happens in Tigard, in personal training or semi-private groups of up to five, with coaches who have your actual numbers in front of them rather than a general recommendation.

The Short Version

Bone loss is not a fixed cost of aging. It is a response to a lack of demand, and the entry dose for changing that is about two to three hours a week. Walking counts, and the research says it counts more than we expected. It also is not the whole answer, because the hip and the spine need loads that walking does not provide.

And before you decide any of that is urgent, you should know where you actually stand, which is a different scan than the one most people have had.

Frequently Asked Questions