The Mental Health Benefits of Swimming: Relieving Anxiety and Depression

Introduction

Mental health issues among people in Taiwan are receiving increasing attention, with the prevalence of anxiety disorders and depression continuing to rise, particularly more pronounced after COVID-19. Aerobic exercise as a complement to psychological treatment is well-supported by evidence, and among the many forms of aerobic exercise, swimming has several unique psychological benefit mechanisms worth exploring in depth. This article analyzes, from the perspectives of neuroscience, psychology, and clinical evidence, why swimming can effectively alleviate anxiety and mild depression.

The Neurobiochemical Effects of Swimming

Endorphins and Endogenous Opioids

Sustained moderate-intensity swimming for 20–30 minutes or more can prompt the brain to release neurotransmitters such as β-endorphins, serotonin, and dopamine. Together, these substances produce:

• A feeling of pleasure similar to a “runner’s high” (the swimming version being a swimmer’s high)
• Reduced anxiety
• Improved mood and increased motivation
• Lowered pain perception

Cortisol (Stress Hormone) Regulation

Research shows that regular swimmers have lower baseline cortisol levels at rest, and their cortisol responses to stressful events are also more moderate—meaning the body has better “stress resilience.”

BDNF (Brain-Derived Neurotrophic Factor)

Aerobic exercise promotes BDNF secretion, which facilitates neurogenesis in the hippocampus (the center for memory and emotional regulation), making it an important mechanism for antidepressant effects. As a form of aerobic exercise, swimming provides the same benefit.

Swimming’s Unique Psychological Environment

Sensory Isolation Effect (Blue Mind Theory)

American marine biologist Wallace J. Nichols proposed the “Blue Mind” theory: when humans come into contact with water (watching it, listening to it, being immersed in it), the brain enters a lower arousal state, and activity in the default mode network of the prefrontal cortex (the brain region responsible for rumination and anxiety loops) decreases.

When swimming:

• Visual and auditory stimuli below the surface are reduced, and stressors from the real world temporarily disappear
• The tactile envelopment of water produces a feeling similar to security
• The rhythmic stroke and breathing pattern resembles the breath-focused attention of meditation

Mindful Swimming

Swimming can serve as dynamic meditation:

• Focusing on the sensation of each stroke, breathing rhythm, and the feeling of bubbles
• Drawing attention away from ruminative thinking back to the present moment
• Compared to formal meditation practice, swimming offers a more natural opportunity for “present-moment focus” training

Benefits of Swimming for Specific Psychological Conditions

Additional Psychological Benefits of Social Swimming

Many swimming pools in Taiwan have morning swim groups, swimming communities, or water aerobics classes. The social benefits of group swimming are no less significant than the exercise itself:

• Social interaction with swimming peers of similar age reduces feelings of isolation
• The sense of accomplishment from achieving swimming goals enhances self-efficacy
• A fixed swimming routine provides a sense of structure in life (especially important for those with depression)

How to Maximize the Psychological Benefits of Swimming

• Choose a pace that relaxes you: Maximizing psychological benefits does not require high-intensity sprints; leisurely swimming at low to moderate intensity works better.
• Try mindful swimming: For the first 5 minutes after getting in the water, deliberately focus on the feel of the water, breathing rhythm, and arm movements; do not think about work or chores.
• Maintain a regular swimming schedule: Regularity offers greater psychological benefits than occasional marathon sessions; swimming 3 times per week is more enduring in its effects than a 2-hour session once a week.
• Don’t rush to check your phone after swimming: Spend 5–10 minutes after your swim soaking in the water or sitting by the poolside enjoying the relaxed feeling, allowing your nervous system to fully settle before returning to daily life.

Practical Recommendations

• Entry strategy for anxiety patients: If you feel uncomfortable in swimming settings due to anxiety, start by trying less crowded times (such as early morning or weekday afternoons), or begin with water walking instead of swimming as a first step.
• Swimming as an adjunct to psychological treatment: Swimming cannot replace professional psychotherapy or medication, but as part of an “exercise prescription,” it is recommended to discuss it with a psychiatrist or psychosomatic medicine physician.
• Resources in Taiwan: Public swimming pools in various cities and counties offer affordable fees (adult tickets typically range from NT$100–150), making swimming one of the most accessible mental health exercise resources for people in Taiwan.

Conclusion

Water is the origin of human life and a natural environment for mental relaxation. Swimming combines the neurochemical benefits of aerobic exercise with the sensory healing effects of water, making it an excellent tool for people in modern Taiwan to maintain mental health amid high-pressure living. There is no need to swim fast or far—simply enter the water regularly and let the body and mind find balance in the rhythm of each breath.

Related Reading

• The Benefits of Swimming for Mental Health: The Relationship Between Water Exercise and Anxiety and Depression
• Swimming and Mental Health: Scientific Research on Water Meditation and Stress Reduction
• How Swimming Improves Depression: The Neural Mechanisms of Aerobic Exercise Promoting Serotonin Secretion
• Swimming and Stress Management: Practical Methods of Water Meditation and Mental Health Research on Regular Swimming