Strength
Bone is not scaffolding. It is living tissue, remodelling continuously in response to the forces placed on it — which means the demands you put through your skeleton help determine how dense it stays.
Bone is not scaffolding. It is living tissue, remodelling continuously in response to the forces placed on it — which means the demands you put through your skeleton help determine how dense it stays.
This is the same mechanical signal that builds muscle, arriving at a different tissue. It is also the reason a conversation about strength after 40 is incomplete without a conversation about bone.
Two cell populations run the remodelling cycle. Osteoclasts resorb old bone. Osteoblasts lay down new. In a healthy adult these roughly balance; the balance tips with age, and tips sharply for women around menopause.
The mechanical signal comes from two places: ground reaction forces, and muscle pulling on its attachment sites. A muscle contracting hard against a loaded bar transmits substantial force through the bone it is attached to. The skeleton reads that as a reason to maintain density where the load is highest.
That last part explains the most commonly misunderstood thing about bone training: the effect is largely site-specific. Loading the spine and hips influences the spine and hips. It does not meaningfully change bone density at the wrist.
Bone responds to being asked to do something. It also responds, in the other direction, to not being asked.
Oestrogen restrains osteoclast activity. When it falls at menopause, resorption accelerates relative to formation, and bone loss becomes considerably faster for a period of years.
This is the clearest reason bone deserves its own conversation rather than a paragraph inside a general training article. The population with the most to gain is postmenopausal women — and it is also the population most often steered away from heavy loading on the assumption that it is unsafe.
The evidence here is better than most people assume.
The LIFTMOR randomised controlled trial put postmenopausal women with low bone mass through high-intensity resistance and impact training. It reported improvements in bone mineral density and physical function, and — importantly, given the assumption above — found the supervised programme was well tolerated in this group.
Meta-analysis supports it. A synthesis of 17 randomised trials covering roughly 690 participants found resistance training significantly improved bone mineral density at the lumbar spine and femoral neck, with higher-intensity protocols performed around three times weekly and sustained over longer durations appearing most effective. Other network meta-analyses reach broadly similar conclusions, with some finding moderate-intensity protocols competitive.
Where the literature disagrees is on the optimal dose, not on whether loading matters.
This is the section that most articles on this subject skip, so we will be direct.
What the evidence supports: progressive resistance training influences bone mineral density at loaded sites, and improves strength, balance and physical function — which are themselves independent contributors to whether someone falls.
What it does not establish here: that training alone treats diagnosed osteoporosis, or that it substitutes for prescribed pharmacotherapy. BMD is a surrogate measure. Fracture is the outcome that matters, and demonstrating fracture reduction requires larger and longer trials than most exercise studies run.
If you have been diagnosed with osteopenia or osteoporosis, this is a conversation with your clinician, not a decision to make from an article. Loading is very likely part of your answer. Whether it is the whole answer depends on your bone density, your fracture history, your medications and your risk profile — and if you have had a vertebral fracture, some movements need modifying rather than adding.
Bone is the tissue people think about only after a scan comes back wrong. It responds to being used, and it responds best while there is still something to defend.
Ready when you are
Read the library first. When you want to act, start with a conversation with a licensed provider, entirely by telehealth.