We’ve all been told that calcium is the key to strong bones – but science shows us that exercise is just as essential. In fact, for adults concerned about osteoporosis or bone loss, physical activity is one of the most powerful tools we have to protect bone health.
“ Bones don’t strengthen by chance; they strengthen in response to load”
Bones are Living Tissue
It’s easy to think of bones as hard, static structures, but they’re actually living, dynamic tissue. Inside every bone are specialised cells that constantly rebuild and reshape the skeleton in response to the stresses we put on it.
- Osteoblasts build new bone
- Osteoclasts break down old bone
- Osteocytes act as the ‘sensors’ detecting strain and signalling when to strengthen or repair bone
This process is called bone remodelling and it keeps our skeleton strong and adaptable throughout life.
Mechanical Loading: The Signal Bones Respond To
Here’s the key point: bones strengthen in response to load. When muscles contract against resistance or when you land on your feet during an impact, tiny stresses travel through the bone tissue. These microscopic strains activate the bone’s cells. Promoting them to deposit more minerals and increase density where it’s needed.
This concept is supported by decades of research. Studies using DEXA scans show that:
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Weight bearing and resistance exercises can improve bone mineral density (BMD) in the spine and hips; two of the most common fracture sites.
- In contrast, non-weight bearing activities like walking, swimming or cycling, have little direct benefit for bone density.
The Science In Action
In clinical trials, postmenopausal women who performed progressive resistance training two to three times a week showed improvements in BMD over 12 months compared to those who did stretching or light aerobic exercise. Importantly, these effects were site-specific, meaning bones strengthening where the loading occurred (for example, squats improving hip density).
The reason is simple: exercise tells your bones what part of the skeleton needs reinforcement. When muscles pull on bone, they send a message that this region is important and must be kept strong.
The Bottom Line
Calcium and vitamin D are essential, but they only give your body the raw materials. Exercise provides the blueprint and the builder.
By regularly stressing your bones in healthy ways, you help maintain bone mass, muscle strength, and balance – all critical factors in preventing osteoporosis and fractures as you age.
Exercise is the only ‘drug’ that both stimulates osteoblasts and improves balance and muscle strength, reducing falls and fractures.
Whether you are approaching perimenopause, have received an osteopenia diagnosis, or simply want to get on the front foot with bone health, come see us at Citrus. Let’s create a personalised plan to build muscle, get stronger, and refresh your zest for life.
