Many adults ask a simple but important question: what is the best exercise for brain health?
Is it walking or cycling? Lifting weights? High-intensity workouts? Or some combination?
Research consistently shows that physical activity supports cognitive function as we age (learn more here). But when comparing aerobic exercise and resistance (strength) training, the answer is more nuanced.
Here is what the evidence currently suggests.
Why Exercise Matters for Brain Health
Regular physical activity is associated with:
- Improved executive function
- Better memory performance
- Slower cognitive decline in aging
- Reduced risk of dementia in observational studies
Exercise also influences brain biology. One commonly studied mechanism is brain-derived neurotrophic factor (BDNF), a protein involved in neuronal survival, plasticity, and learning.
In humans, BDNF typically increases briefly after a bout of exercise. In adults over 60, structured exercise programs can increase resting peripheral BDNF on average, though results vary across studies.
Other biological mechanisms are also being studied, including inflammation, metabolic health, and the potential role of micronutrients (see: multivitamins and cognitive function).
Aerobic Exercise and the Brain
What Counts as Aerobic Exercise?
Aerobic exercise includes:
- Brisk walking
- Cycling
- Swimming
- Jogging
- Rowing
These activities elevate heart rate and improve cardiovascular fitness.
Effects on Cognition
Aerobic training has been associated with:
- Improved processing speed
- Better executive function
- Increased hippocampal volume in some studies
- Increases in circulating BDNF after exercise sessions
Observational research suggests that individuals who engage in regular aerobic activity may have lower dementia risk. However, causality cannot be firmly established.
Strengths of Aerobic Exercise
Aerobic exercise improves vascular health, blood flow, and metabolic function all of which are strongly linked to cognitive aging.
Because vascular disease is a major contributor to cognitive decline, improving cardiovascular fitness is likely one important pathway through which aerobic exercise supports brain health.
Resistance (Strength) Training and the Brain
What Counts as Resistance Training?
Resistance training includes:
- Free weights
- Machines
- Bodyweight exercises
- Resistance bands
The goal is to improve muscular strength and functional capacity.
Effects on Cognition
Resistance training has been associated with:
- Improvements in executive function
- Enhanced attention
- Possible increases in BDNF in some studies
- Structural brain changes in certain trials
The literature comparing aerobic and resistance training is mixed. Both modalities have been associated with increases in peripheral BDNF in older-adult studies.
Unique Benefits of Strength Training
Strength training improves:
- Insulin sensitivity
- Glucose regulation
- Muscle mass
- Functional independence
Metabolic health and insulin resistance are closely connected to cognitive risk. Therefore, resistance training may support brain health through metabolic pathways.
So, What Is the Best Exercise for Brain Health?
Evidence comparing modalities is mixed.
Both aerobic and resistance training:
- Improve certain cognitive outcomes
- Influence brain-related biomarkers
- Support vascular and metabolic health
Combined (aerobic + resistance) training is a reasonable “best of both” approach for older adults when the goal includes both fitness and brain-health biomarkers.
Importantly:
Exercise programs in older adults — including those with mild cognitive impairment — can improve some cognitive outcomes. BDNF is a plausible contributor but not proven as the causal driver.
No single exercise type has been proven to prevent Alzheimer’s disease.
Practical Exercise Guidelines for Cognitive Support
1. Combine Modalities
Include both aerobic and resistance training weekly if medically appropriate.
2. Prioritize Consistency
Moderate exercise performed regularly is more sustainable than extreme intensity.
3. Protect Vascular Health
Exercise works synergistically with:
- Blood pressure control
- Healthy nutrition, including patterns such as the Mediterranean diet for brain health
- Weight management and vascular risk control
- Adequate sleep and REM sleep quality
4. Seek Medical Guidance if Needed
Older adults with medical conditions should consult a healthcare provider before starting new exercise programs.
The Balanced View
Aerobic exercise improves cardiovascular function and may influence hippocampal health.
Resistance training improves metabolic stability and functional capacity.
Both are associated with improved cognitive outcomes in older adults.
The strongest current evidence supports regular physical activity — not one exclusive modality.
For brain health, the question may not be “aerobic or strength?”
It may be:
How can I move consistently and safely across the week?
Bottom Line
There is no single proven “best” exercise for preventing dementia.
However, regular aerobic and resistance training are both associated with improved cognitive function and brain-related biomarkers.
A combined, sustainable program is likely the most balanced approach for supporting brain health across aging.
Frequently Asked Questions
Is aerobic exercise better than strength training for brain health?
Research comparing the two is mixed. Both aerobic and resistance training are associated with improvements in cognitive function and brain-related biomarkers.
Does exercise increase BDNF?
In humans, BDNF typically increases briefly after exercise. Some structured training programs may increase resting peripheral BDNF in older adults, though findings vary.
Can exercise prevent Alzheimer’s disease?
No type of exercise has been proven to prevent Alzheimer’s disease. However, regular physical activity is associated with better cognitive outcomes and overall brain health.
How often should I exercise for brain health?
Current guidelines generally recommend regular moderate aerobic activity combined with strength training several times per week, adjusted for individual health status.