Exercise and Brain Health: What Research Links and How to Move Safely

Being active is one of the most studied habits in brain health research. Studies link it with a lower risk of dementia, but they have not proven that exercise prevents dementia. What is clear is that movement helps with strength, balance, mood and sleep at any age. This page covers what the research says, how much activity older adults are advised to get, and gentle ways to move with someone living with dementia.

Does exercise lower the risk of dementia?

Research suggests that physically active people are less likely to develop dementia, but the evidence has limits. The 2024 Lancet Commission on dementia lists physical inactivity as one of 14 modifiable risk factors. Together, these 14 factors account for about 45% of dementia worldwide in its model.

Here is what the evidence looks like:

• Observational studies point one way. A review of 58 studies, discussed by the Commission, found that physically active people had about a 20% lower risk of dementia. The biggest difference was between people who were almost completely inactive and those who did at least some activity.
• The link may run both ways. The Commission notes that being inactive may raise risk. It also notes that the early brain changes of dementia, which start years before diagnosis, may make people less active.
• Trials are less clear. In one trial, 945 older adults with an average age of 78 were assigned to five years of twice-weekly supervised exercise or to a comparison group. At the end, thinking skills did not differ clearly between the groups. Many people in the comparison group were also active, which makes the result harder to read.

The National Institute on Aging (NIA) puts it plainly. No clear link between physical activity and preventing Alzheimer’s has been shown, and there is not enough trial evidence to say exercise prevents or slows it. Exercise still lowers the risk of falls, depression, diabetes, high blood pressure and stroke. Some of those conditions are themselves linked with cognitive decline.

The honest takeaway is to move because it helps you feel and function better today. Any brain benefit is a possible bonus, not a promise.

How much activity do older adults need?

The CDC’s guidance for adults 65 and older suggests three kinds of activity each week:

These are goals, not entry requirements. The CDC says that if you cannot meet them, you should be as active as your abilities and health allow. Some activity is better than none.

Gentle ways to move for older adults

• Walk with company. A daily walk with a friend, neighbor or walking group adds conversation and safety.
• Chair exercises. Seated arm raises, ankle circles, marching in place and chair yoga build strength without balance risk.
• Dance in the kitchen. Put on music from the person’s teens and twenties and sway, tap or step. Our music activities guide has ideas.
• Strength with household items. Lift filled water bottles or soup cans while watching a favorite show.
• Garden or do chores. Watering plants, raking, sweeping and folding laundry all count. See outdoor and gardening activities and household tasks.
• Water exercise. The NIA lists water aerobics classes as one option for people who find land exercise hard on their joints.

How to exercise with someone living with dementia

For a person living with dementia, the aim is comfort, enjoyment and keeping everyday abilities, not reaching a number. The NIA says physical activity helps keep the muscles, joints and heart of someone with Alzheimer’s in good shape, and can also improve mood and sleep. Check with their doctor before starting a new routine. Tips from the NIA’s caregiver guide include:

1. Walk together each day. Choose a safe, familiar path clear of obstacles. If the person walks alone, an ID bracelet with your phone number is a good idea.
2. Try exercise videos for older adults. Follow along together, seated or standing.
3. Keep sessions short. Several short “mini-workouts” may work better than one long one.
4. Add music. Familiar songs make movement feel like an activity, not a task. Dance if the person enjoys it.
5. Offer water and comfortable shoes. Offer water or juice during and after, and choose comfortable clothes and well-fitting shoes made for exercise.

If walking is hard, the NIA’s guide to caring for a person with Alzheimer’s suggests seated options. These include chair exercises or yoga, bean bag toss, tossing a soft ball or balloon, stretching bands, lifting light household items, and pedal exercisers. Simple jobs like sweeping and dusting count as well.

Be realistic about what movement can do. The Lancet Commission found no evidence that exercise reduces behavior changes such as agitation. Move together because it can feel good, not as a way to fix a hard afternoon. If the person says no, that is fine. Our guide on when they say no has gentle ways to try again later. Ending early, or just sitting outside together, is a good outcome too.

After moving, a quiet pause such as Calm Breathing can help you both settle. For a seated activity with gentle arm movement, Sort Together and Picture Bingo work well at a table.

Balance and fall safety

Falls are common and serious. The CDC reports that more than one in four older adults falls each year, but fewer than half tell their doctor. Falling once doubles the chance of falling again. Risk factors the CDC lists include:

• Weakness in the legs and hips
• Trouble with walking and balance
• Some medicines, including sedatives and some antidepressants
• Vision problems
• Foot pain or poor footwear
• Home hazards such as clutter, throw rugs and broken steps

To move more safely:

• Use a sturdy chair without wheels, and keep a counter or rail within reach for standing exercises.
• Clear the space of rugs, cords and clutter first.
• Go slowly when standing up, and stop if the person feels dizzy or unsteady.
• Wear supportive shoes, not socks or loose slippers.
• Practice balance near support. Standing up from a chair and walking heel to toe are CDC examples of balance activities.

The CDC advises that an older person who falls and hits their head should see a doctor right away, especially if they take blood thinners.

Talk with a doctor

Check with a doctor before starting a new exercise routine, especially for someone who has heart or lung problems, joint pain, balance problems, or dementia. A doctor or physical therapist can suggest safe activities and check whether medicines affect balance. Tell the doctor about any fall, even one without injury. If something hurts or feels wrong during exercise, stop. For sudden chest pain, trouble breathing, or sudden confusion, call 911.

This page is general information, not medical advice. See our medical disclaimer. For the bigger picture, read what research says about dementia risk factors and whether dementia can be prevented.