When most people think about exercise, they think about losing weight, improving heart health, or building muscle.

But what if one of the greatest benefits of exercise had nothing to do with your body at all?

What if it was actually one of the most powerful things you could do for your brain?

As a Gerontologist, one topic that continues to fascinate me is the relationship between physical activity and brain health. After reading the work of neuroscientist Dr. Jennifer Heisz, it became even clearer just how remarkable the brain's ability to adapt truly is.

While there is no guaranteed way to prevent dementia, research continues to show that regular physical activity is one of the most important modifiable lifestyle factors for maintaining brain health as we age.

Your Brain Is Constantly Changing

For many years, scientists believed that the adult brain was relatively fixed and that once brain cells were lost, they were gone forever.

Today, we know that isn't entirely true.

The brain has an incredible ability to adapt throughout life, a concept known as neuroplasticity. One of the areas where this is especially important is the hippocampus.

Exercise Helps the Brain Stay Healthy

One of the most exciting discoveries in neuroscience is that exercise doesn't simply strengthen muscles—it also strengthens the brain.

Regular physical activity increases blood flow to the brain, delivering oxygen and nutrients that support healthy brain function.

Exercise also stimulates the release of proteins such as brain-derived neurotrophic factor, or BDNF. BDNF is sometimes described as “fertilizer for the brain” because it helps brain cells grow, survive, and form new connections.

Research also suggests that exercise supports the health of the hippocampus and may help preserve its volume as we age. Animal studies have shown that physical activity can stimulate the formation of new neurons in this region of the brain, while human research demonstrates improvements in brain plasticity and memory.

Simply put, movement gives your brain the environment it needs to function at its best.

Why Interval Training Is So Interesting

Dr. Jennifer Heisz's research highlights another fascinating finding: exercise intensity appears to matter.

While any movement is better than none, studies suggest that periods of higher-intensity exercise, often performed as interval training, may produce even greater increases in blood flow and stimulate larger releases of BDNF.

That doesn't mean everyone needs to sprint or complete intense workouts.

The key is working at an intensity that is both safe and appropriate for your individual abilities.

Exercise Is One of the Few Risk Factors We Can Change

Although age and genetics cannot be controlled, researchers have identified several modifiable risk factors that influence the likelihood of developing dementia.

Physical inactivity is one of them.

The encouraging news is that this also means becoming more physically active is one of the actions we can take to support long-term brain health.

Exercise works alongside other healthy lifestyle habits to help reduce dementia risk.

• Managing blood pressure
• Eating a nutritious diet
• Staying socially connected
• Getting quality sleep
• Protecting hearing
• Keeping the brain mentally engaged

No single strategy guarantees prevention, but together these habits can make a meaningful difference.

It's Never Too Late to Start

One of the most common things I hear is:

The good news is that the brain continues to respond to physical activity throughout life.

A consistent walking routine, personalized strength training, balance exercises, or a supervised senior fitness program can all contribute to healthier aging while supporting both the body and the brain.