You probably know that physical activity supports your heart and muscles. But did you know that exercise may be one of the strongest tools available for your brain health? Research increasingly suggests that regular physical activity is associated with reduced cognitive decline and lower dementia risk. Here is what the science suggests about how exercise supports your brain.
How Exercise Changes Your Brain
When you exercise, your brain undergoes real, measurable changes. Physical activity increases blood flow to the brain, delivering more oxygen and nutrients to brain cells. It triggers the release of growth factors, proteins that support the health and growth of brain cells. This is particularly true for the hippocampus, the region critical for memory formation.
Exercise also supports neuroplasticity, your brain's ability to reorganise itself and form new neural connections. This underlies learning and memory; a more plastic brain is generally a more adaptive and resilient brain.
The Evidence: What Research Shows
Studies consistently report that people who are physically active tend to have better cognitive function, slower cognitive decline, and lower dementia risk. A large study of over 1,000 adults reported that those with higher physical fitness levels had significantly less brain atrophy in critical memory regions compared to less fit individuals.
Another study reported that people who increased their physical activity after age 60 showed improvements in cognitive function within just a few months. Meaningful benefits are possible at any age.
Types of Exercise That Support Brain Health
Aerobic Exercise
Brisk walking, swimming, cycling, jogging, and other activities that elevate your heart rate are particularly beneficial for the brain. Aim for 150 minutes of moderate-intensity aerobic activity per week, the standard recommendation for healthy ageing.
Strength Training
Resistance training builds not just muscle but also supports brain health. Strength training may help protect against cognitive decline independently of aerobic activity. Include strength training two or more days per week.
Balance and Coordination Activities
Activities like tai chi, yoga, and dancing challenge your brain to coordinate movement and balance. These activities offer cognitive stimulation in addition to physical benefits.
The Mechanism: Why Exercise Supports Your Brain
Increased Blood Flow
Exercise is associated with increased cerebral blood flow, meaning more oxygen and nutrients reach brain cells. This is particularly important as we age; reduced brain blood flow is associated with cognitive decline.
Reduced Inflammation
Chronic inflammation in the brain is associated with cognitive decline. Exercise has anti-inflammatory effects, reducing levels of inflammatory molecules that may damage brain tissue.
Reduced Cardiovascular Risk
Heart disease and stroke are associated with brain damage. By supporting heart health, exercise indirectly supports brain health.
Brain-Derived Neurotrophic Factor
Exercise increases levels of brain-derived neurotrophic factor (BDNF), a protein that supports the growth and survival of brain cells. BDNF has sometimes been called fertiliser for the brain.
Better Metabolic Health
Exercise improves blood sugar control and is associated with reduced diabetes risk. Good metabolic health directly supports brain function.
Improved Sleep
Exercise is associated with better sleep quality, and good sleep is essential for memory consolidation and brain health.
Getting Started With Exercise
The good news is you do not need to be an athlete to benefit. Moderate activity is enough to see meaningful change. If you have been inactive, start gradually.
- Begin with 10 to 15 minutes of activity and gradually build up to 30 minutes or more
- Choose activities you enjoy; you are more likely to stick with them
- Consider brisk walking, swimming, water aerobics, or cycling, all accessible options
- Include strength training using weight machines at a gym, resistance bands, or your own body weight with exercises like squats and modified push-ups
- If you have health concerns or have been inactive, check with your GP before starting a new exercise programme
A Practical Step You Can Take This Week
Block out three 20-minute walking slots in your calendar this week, the same way you would book a coffee with a friend. Treating brain-friendly movement as an appointment, rather than something you do 'when there is time', is the simplest way to make it stick.
Important Note
This information is general in nature and is not a substitute for professional medical advice. Please consult your GP before making changes to your health routine.