The Neuroscience of How Exercise Rewires the Anxious Brain

March 9, 2026

Michael M. Newman, PhD, Author and Doctor of Natural Medicine

Tom O'Connor, Publisher

Author Michael M. Newman is a Doctor of Natural Medicine and a Certified Neuroscience Coach. He received his DNM/PhD from Quantum University of Integrative Medicine. He earned his PhD in Natural Medicine for his research on the neuroscience of stress. 

Dr. Newman is also a board-certified Holistic Health Practitioner, a member of the International Association of Therapists, and a Fellow with the American Institute of Stress. He has a clinical focus on: 

● Neuroscience of Stress 

● Health-based Neuroscience 

● Brain Health 

● Neuroplasticity 

According to Dr. Michael M. Newman 

Anxiety is a complex condition linked to specific patterns of neural activity that affect brain function. Research shows that it often arises from hyperactivity in the amygdala, which processes fear and emotional responses. This can lead to heightened sensitivity to stressors.

Dysregulation of stress hormones, especially cortisol, can worsen anxiety, disrupting bodily systems and impairing cognitive function. Additionally, altered brain connectivity between the amygdala and prefrontal cortex complicates anxiety. The prefrontal cortex, which is responsible for decision-making, often struggles to regulate emotional responses driven by the amygdala. (Ressler, 2010). Additionally, imbalances in key neurotransmitters, like serotonin and norepinephrine, can exacerbate anxiety symptoms (Martin et al., 2009). 

Exercise emerges as one of the most effective non-pharmacological interventions for anxiety, influencing these biological underpinnings in significant ways. Physical activity not only fosters neurogenesis—the formation of new neurons, particularly in the hippocampus—but it also promotes the release of endorphins and serotonin, which can enhance mood and alleviate stress. Moreover, regular exercise can help modulate the body's stress response by reducing cortisol levels, thereby improving overall emotional regulation and resilience against anxiety. This multifaceted impact on both the structure and chemical balance of the brain makes exercise a powerful tool in the management of anxiety disorders (Broocks, 1999; Broocks et al., 2001) (DeBoer et al., 2012).

This network-level rewiring is the reason regular exercise is associated with a long-term reduction in chronic anxiety.

*You might also like Michael Newman's other article on anxiety

What Types of Exercise Are Most Effective?

1. Aerobic Exercise (Most Supported by Evidence): Participating in aerobic activity for 30 to 45 minutes, three to five times each week, can lead to significant and measurable changes in brain health and function. This type of exercise, including running, cycling, swimming, or brisk walking, has been shown to improve cardiovascular fitness, increase blood flow to the brain, and enhance neuroplasticity. These benefits may contribute to improved cognitive performance, greater memory retention, and a reduced risk of cognitive decline with age. Regular aerobic exercise not only boosts mood and reduces symptoms of anxiety and depression but also promotes the development of new neuronal connections, ultimately supporting overall brain health.

2. High-Intensity Interval Training (HIIT): is a dynamic and effective exercise regimen characterized by short bursts of intense physical activity followed by brief periods of rest or lower-intensity exercise. This approach not only optimizes calorie burning but also significantly benefits brain-derived neurotrophic factor (BDNF). This protein plays a critical role in neuroplasticity, cognitive function, and overall brain health. Additionally, HIIT has been shown to help regulate cortisol levels, a hormone often linked to stress. By incorporating HIIT into a regular fitness routine, individuals may experience improvements in mental clarity, mood stabilization, and reduced stress-related symptoms, promoting both physical and mental resilience.

3. Yoga, Qi Gong, and Tai Chi are effective mind-body practices that help calm the nervous system by targeting the amygdala, which processes emotions like fear and anxiety. These disciplines promote relaxation and mindfulness, thereby reducing amygdala hyperactivity associated with stress. In addition, they enhance vagal tone, which regulates heart rate and relaxation responses. By combining controlled breathing, gentle movement, and meditation, these practices foster balance in the autonomic nervous system, leading to greater calm, improved emotional regulation, and enhanced well-being.

4. Strength Training: Engaging in a variety of strength-training exercises has been scientifically shown to boost gamma-aminobutyric acid (GABA) levels. This neurotransmitter plays a crucial role in regulating mood and reducing feelings of anxiety. By incorporating resistance training into your routine, you may experience improvements not only in physical strength but also in emotional well-being.

Moreover, current research underscores that the most significant benefits for both mental health and physical fitness are best achieved through a well-rounded program that combines aerobic exercises—such as running, swimming, or cycling—with strength training. This dual approach not only enhances cardiovascular health but also promotes muscle development and psychological resilience, thereby improving overall quality of life.

Conclusion: 

The leading treatments for anxiety disorders today include cognitive-behavioral therapy (CBT) and pharmacotherapy (Powers et al., 2008). While these methods are effective, it is noteworthy that 14–43% of patients do not respond to treatment (Barlow et al., 2000), and 18–48% experience a relapse within six months (Foa et al., 2005). So, why not consider integrating lifestyle changes, particularly exercise, as a complementary intervention for managing anxiety disorders? Research highlights the various biological, behavioral, and psychological mechanisms through which exercise can positively influence anxiety symptoms.

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Dr. Michael M. Newman, DNM., Ph.D., HHP., FAIS. Doctor of Natural Medicine, Author, Researcher: Neuroscience coach; Stress and Generalized Anxiety Disorder. Michael lives in London, Ontario, Canada. He can be reached at his website: www.newmanintegratedhealth.com 

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