Boost Your Brain: The Crucial Role of Exercise in Cognitive Health

The connection between exercise and cognitive health is becoming increasingly clear. Regular physical activity does far more than strengthen muscles and improve cardiovascular fitness—it also supports many of the biological processes that help keep our brains healthy as we age.

Exercise influences blood flow to the brain, cardiovascular and metabolic health, inflammation, mood, sleep, and neuroplasticity—the brain’s remarkable ability to adapt and reorganize throughout life. These effects can play an important role in supporting memory, learning, and overall cognitive function.

Muscle health is also an important part of this relationship. Skeletal muscle is not simply responsible for movement; it is metabolically active tissue that communicates with other organs, including the brain, through signaling molecules released during physical activity.

Together, these connections reveal something important: what benefits the body often benefits the brain. Maintaining cardiovascular fitness, muscle strength, and regular movement throughout life may be one of the most meaningful ways we can support long-term brain health and healthy aging.

How Does Exercise Support Cognitive Health?

When we exercise, changes occur throughout the body that can positively influence the brain. Physical activity improves circulation, challenges the cardiovascular system, affects metabolic signaling, and stimulates biological processes involved in maintaining healthy brain function.

Regular physical activity may help support:

• Memory and learning
• Executive function, including planning and decision-making
• Attention and cognitive processing
• Mood and emotional well-being
• Cardiovascular and metabolic health
• Neuroplasticity and healthy brain aging
• Physical function and independence as we age

Rather than thinking of exercise simply as a way to burn calories, manage weight, or build muscle, it is helpful to see movement as a whole-body intervention. The brain, muscles, cardiovascular system, and metabolism are deeply interconnected, and regular physical activity has the potential to benefit all of them through several interconnected biological pathways.

BDNF and Neuroplasticity

One important area of research involves brain-derived neurotrophic factor (BDNF).

BDNF is a protein involved in the health and function of neurons and plays an important role in neuroplasticity—the brain’s ability to adapt, reorganize, and modify connections between neurons.

These processes are fundamental to learning and memory.

Physical activity, particularly aerobic exercise, has been associated with changes in BDNF signaling. This is one of several mechanisms researchers are studying to better understand how exercise may influence cognitive function and brain health.

Think of neuroplasticity as the brain’s ability to continually adapt to the demands placed upon it. Movement is one of many stimuli that may help support that adaptability.

Exercise and Neurogenesis

Neurogenesis refers to the formation of new neurons.

The hippocampus—a region of the brain heavily involved in learning and memory—has received particular attention in research examining physical activity and neurogenesis.

Much of our mechanistic understanding of exercise-induced neurogenesis comes from animal research, so it is important not to overstate what has been demonstrated in humans.

However, human research also supports beneficial associations between regular physical activity and hippocampal structure, function, and cognition.

Together, these findings suggest that staying physically active may help create a biological environment that supports brain health throughout life.

Exercise, Blood Flow, and Vascular Brain Health

A healthy brain depends on a healthy blood supply.

The brain requires a continuous supply of oxygen and nutrients, making cardiovascular and vascular health particularly important for cognitive function.

Regular aerobic exercise can improve cardiovascular fitness and support healthy blood vessel function.

Activities such as:

• Brisk walking
• Cycling
• Swimming
• Hiking
• Running
• Dancing

can challenge the cardiovascular system and, when performed consistently, improve aerobic capacity.

This matters because many of the same risk factors that affect cardiovascular health—including hypertension, insulin resistance, diabetes, smoking, and physical inactivity—can also influence long-term brain health.

Supporting cardiovascular health is therefore an important part of supporting cognitive health.

The Connection Between Muscle and Brain Health

Muscle does much more than generate movement.

Skeletal muscle is increasingly recognized as an active metabolic and endocrine organ that communicates with other tissues throughout the body.

When muscles contract during physical activity, they release signaling molecules known as myokines. These molecules participate in communication between muscle and other organs and may influence processes related to:

• Metabolism
• Inflammation
• Energy regulation
• Vascular function
• Brain health

This emerging area of research is helping us understand why preserving muscle mass may be important not only for strength and mobility but also for overall metabolic and neurological health.

Myokines and the Brain

One myokine that has received considerable research attention is irisin.

Irisin is released in association with physical activity and has been investigated for its potential role in metabolism and brain function.

Preclinical and emerging human research suggests that muscle-derived signaling molecules may contribute to some of the neurological benefits associated with exercise.

The science continues to evolve, but it is increasingly apparent that muscle and brain health are biologically interconnected.

Why Strength Training Matters for Cognitive Health

Aerobic exercise often receives the most attention when discussing brain health, but resistance training is also an important part of a comprehensive exercise program.

Strength training helps preserve and build skeletal muscle, which becomes increasingly important as we age.

Beginning in adulthood, muscle mass and strength can gradually decline unless we actively work to maintain them. Loss of muscle can affect much more than appearance—it can influence metabolic health, mobility, balance, bone health, and independence.

Resistance exercise may also support cognitive health through several pathways.

Supporting Metabolic Health

Skeletal muscle plays a major role in glucose metabolism.

Maintaining adequate muscle mass can support insulin sensitivity and metabolic health—factors that are increasingly recognized as relevant to long-term brain health.

Supporting Functional Independence

Strength allows us to continue performing everyday activities as we age.

Getting out of a chair, climbing stairs, carrying groceries, lifting luggage, getting up from the floor, and maintaining balance all require sufficient strength and physical capacity.

Preserving these abilities can help us remain active and independent later in life.

Supporting Bone Health

Weight-bearing and resistance exercises also help maintain bone strength.

Strong muscles and healthy bones work together to support mobility, reduce frailty, and help individuals remain physically active throughout life.

Supporting Mental Health

Resistance training has also been studied for its potential benefits for mood and symptoms of anxiety and depression.

Mental and cognitive health are closely interconnected, making emotional well-being another important consideration when discussing the broader benefits of exercise.

Aerobic Exercise vs. Strength Training: Do You Need Both?

Rather than asking which type of exercise is “best” for the brain, it is helpful to recognize that different forms of exercise provide complementary benefits.

Aerobic exercise primarily challenges the cardiovascular and respiratory systems and can improve:

• Cardiovascular fitness
• Circulation
• Endurance
• Metabolic health

Resistance training primarily challenges the muscular system and can improve:

• Muscle mass
• Strength
• Bone health
• Insulin sensitivity
• Functional capacity

Balance, mobility, and coordination exercises provide additional benefits, particularly as we age.

For most people, a well-rounded approach incorporating aerobic exercise, resistance training, balance, mobility, and regular everyday movement is likely to provide broader benefits than relying on one form of exercise alone.

Exercise, Mood, and Mental Health

The benefits of exercise are not limited to memory and cognition.

Physical activity can also influence mood, stress regulation, and emotional well-being.

Exercise affects multiple neurotransmitter and signaling systems and has been associated with improvements in symptoms of depression and anxiety in many individuals.

Movement may also indirectly support mental and cognitive health by improving:

• Sleep quality
• Stress resilience
• Self-confidence
• Social connection
• Energy
• Physical function

A walk with a friend, a group exercise class, gardening, hiking, dancing, or playing a sport can provide benefits that extend beyond the exercise itself.

The social and emotional aspects of movement matter too.

Training for Healthy Aging and Functional Independence

One useful way to think about exercise is not simply in terms of what your body can do today, but what you want it to be capable of doing decades from now.

Longevity physician Dr. Peter Attia popularized the concept of the “Centenarian Decathlon”—identifying the physical abilities you would like to retain in later life and working backward to train for them.

These goals might include being able to:

• Carry groceries
• Climb several flights of stairs
• Lift luggage into an overhead compartment
• Get up from the floor independently
• Maintain good balance
• Walk uphill
• Hike or travel
• Play with grandchildren
• Participate in sports or recreational activities

The specific activities will differ from person to person.

The underlying principle is what matters: we should train today for the physical capacity we want to preserve tomorrow.

Strength, cardiovascular fitness, balance, coordination, and mobility all contribute to maintaining independence and quality of life as we age.

How Much Exercise Do You Need for Brain Health?

You do not need to become an endurance athlete to benefit from physical activity.

Current physical activity guidelines generally recommend that adults aim for at least 150 minutes of moderate-intensity aerobic activity per week, 75 minutes of vigorous-intensity activity, or an equivalent combination of the two, along with muscle-strengthening activities on at least two days per week.

These recommendations provide a useful general framework, but exercise should always be individualized.

Age, current fitness level, medical conditions, injuries, medications, mobility, and personal goals all influence what type and amount of exercise is appropriate.

Perhaps most importantly, consistency matters.

A sustainable exercise routine that you can maintain is generally more valuable than an overly ambitious program that lasts only a few weeks.

Everyday Movement Matters Too

Structured workouts are valuable, but they are not the only form of physical activity that matters.

Daily movement can accumulate throughout the day. Consider opportunities to:

• Take a walk after meals
• Use the stairs when appropriate
• Garden
• Walk while talking on the phone
• Break up long periods of sitting
• Carry your own groceries
• Play actively with children or grandchildren
• Walk or cycle for short trips when practical

Exercise does not have to occur exclusively inside a gym.

Creating a lifestyle that naturally includes movement may be one of the most sustainable approaches to long-term physical and cognitive health.

INTERNAL LINK: Link “sustainable approaches” to your article Beyond Resolutions: Embracing Slow, Sustainable Change.

Other Lifestyle Factors That Support Cognitive Health

Exercise is powerful, but brain health does not depend on one intervention alone.

A comprehensive approach to healthy aging should also consider several other modifiable lifestyle factors.

Nutrition

A dietary pattern emphasizing whole, minimally processed foods can support cardiovascular, metabolic, and brain health.

The Mediterranean dietary pattern, in particular, has been extensively studied in relation to cardiovascular and cognitive health.

INTERNAL LINK: If you have a Mediterranean diet or nutrition article, hyperlink “Mediterranean dietary pattern.”

Sleep

Quality sleep is essential for memory consolidation, emotional regulation, metabolic health, and normal brain function.

Most adults generally require approximately 7–9 hours of sleep per night, although individual needs vary.

Mental Stimulation

Learning new skills, reading, playing music, solving problems, and engaging in mentally challenging activities can help keep the brain actively engaged.

Combining cognitive stimulation with physical activity may be particularly valuable.

Stress Management

Chronic stress can affect sleep, mood, metabolic health, and overall well-being.

Acupuncture, meditation, breathing exercises, yoga, time in nature, social connection, and other stress-management practices can be incorporated into a comprehensive brain-health strategy.

INTERNAL LINK: This is a good place to link naturally to The Vagus Nerve: A Key to Health and Healing. For example, you could hyperlink “stress regulation and nervous system health.”

Social Connection

Maintaining meaningful relationships and regular social engagement is another important component of healthy aging.

Interestingly, many forms of physical activity—walking groups, fitness classes, recreational sports, dancing, and hiking—can combine movement with social interaction.

Frequently Asked Questions About Exercise and Cognitive Health

Does exercise improve cognitive health?

Regular physical activity is associated with benefits for several aspects of cognitive health, including executive function, memory, mood, and overall brain health.

Exercise also supports cardiovascular and metabolic health, both of which are important for healthy brain aging.

What type of exercise is best for brain health?

No single type of exercise appears to provide every benefit associated with physical activity.

A combination of aerobic activity, resistance training, balance work, mobility, and regular daily movement provides complementary benefits.

The best exercise program is also one that is safe, appropriate for your health and fitness level, and sustainable over time.

Can strength training help brain health?

Research suggests that resistance training may support aspects of cognitive function while also helping preserve muscle mass, metabolic health, bone health, and functional independence.

For these reasons, strength training is an important part of a comprehensive healthy-aging strategy.

Is walking good for cognitive health?

Yes. Walking is an accessible form of aerobic physical activity that can contribute to cardiovascular fitness and overall health.

Brisk walking can be particularly useful for increasing moderate-intensity physical activity, and walking outdoors or with others may provide additional benefits related to stress reduction and social connection.

Is it ever too late to start exercising?

For most people, increasing physical activity can provide benefits at many stages of life.

The appropriate starting point depends on your current health, mobility, and fitness level.

Someone who has been sedentary does not need to immediately begin an intensive exercise program. Starting gradually and building capacity over time can be an effective and sustainable approach.

The Bottom Line: Movement Is an Investment in Your Brain

The connection between exercise and cognitive health extends far beyond simply “getting fit.”

Physical activity influences cardiovascular health, metabolism, inflammation, muscle function, mood, sleep, neuroplasticity, and many of the biological systems that help support a healthy brain.

You do not need to become an endurance athlete or spend hours in the gym to benefit.

Walking, cycling, swimming, resistance training, balance exercises, recreational activities, and simply moving more throughout the day can all contribute to a comprehensive brain-health strategy.

The goal is not perfection—it is consistency.

Building and maintaining physical capacity throughout life may be one of the most meaningful investments we can make in both our cognitive health and our ability to remain active and independent as we age.

References

• Bourassa, Y. et al. (2021). The effects of exercise on brain-derived neurotrophic factor levels in humans. Journal of Neurochemistry, 156(5), pp. 624-637.
• Bredesen, D.E. (2018). The End of Alzheimer's: The First Program to Prevent and Reverse Cognitive Decline. Avery.
• Clark, M.A. et al. (2020). Exercise-induced neurogenesis in the hippocampus: A review of animal and human studies. Neuroscience & Biobehavioral Reviews, 118, pp. 113-123.
• Fitzgerald, K. (2021). Younger You: Reduce Your Bio Age and Live Longer, Better. Hachette Go.
• Huberman, A. (2021). The Huberman Lab Podcast.
• Hyman, M. (2020). Food Fix: How to Save Our Health, Our Economy, Our Communities, and Our Planet--One Bite at a Time. Little, Brown Spark.
• Muzaffar, S., Tyagi, A. and Pugazhenthi, S. (2025) Therapeutic potential of irisin in neurodegenerative diseases, International Journal of Molecular Sciences, 26(23), p. 11348.
• Lyon, G. (2020). Muscle-Centric Medicine.
• Pedersen, B.K. & Febbraio, M.A. (2018). Muscle as an endocrine organ: Focus on muscle-derived interleukin-6. Physiological Reviews, 98(3), pp. 1379-1406.
• Perlmutter, D. & Loberg, K. (2020). Brain Wash: Detox Your Mind for Clearer Thinking, Deeper Relationships, and Lasting Happiness. Little, Brown Spark.