Aerobic Exercise Rivals Antidepressants in Large Review

Two people cycling near the Golden Gate Bridge in San Francisco (Photo by Maridav on Shutterstock)

Running, cycling, or even just walking can be as effective as taking a pill for depression. A comprehensive analysis of nearly 80,000 people found that exercise reduced symptoms of depression with an effect comparable, and in some cases greater, to what is typically reported for antidepressant medications and psychotherapy in previous research.

The figures are convincing. Exercise produced an effect size of -0.61 for depression in this review. The authors note that this magnitude matches or exceeds effect sizes from previous research on antidepressants (-0.36) and psychotherapy (-0.34). The research, published in the British Journal of Sports Medicineexamined data from more than 1,000 individual studies covering children and older adults.

Lead researcher Neil Richard Munro and his team at James Cook University in Australia specifically excluded anyone with chronic physical illnesses like heart disease or cancer. This decision is important because it isolates the true effect of exercise on mental health, without other health issues muddying the waters.

Groups that benefit most from exercise

Young adults between the ages of 18 and 30 saw the greatest improvements, with exercise producing particularly strong symptom reductions in this age group. This timing is important since this age often marks the time when depression first appears.

New mothers also experienced powerful benefits. Postpartum depression hits hard, and finding effective treatments during this vulnerable time can seem impossible. Exercise programs designed for women after childbirth have produced a strong reduction in symptoms without the need for medications while breastfeeding.

What Type of Exercise Works for Depression

Aerobic exercise came out on top. Running, walking, cycling (activities that get your heart pumping) showed the strongest effects. However, resistance training, yoga, tai chi, and mixed programs have also been helpful. The best exercise is the one you actually do.

The group settings made a real difference. People who exercised with others experienced greater improvements than those who exercised alone. Maybe it’s the responsibility, maybe it’s the social connection, maybe it’s just more fun. Whatever the mechanism, working out together seems to add something beyond the physical movement itself.

Supervised programs also beat unsupervised programs. Having a coach or instructor to guide your training has produced better mental health results than going it alone.

Depression and anxiety require different exercise plans

Interestingly, depression and anxiety respond to different exercise prescriptions.

For depression, longer programs were most effective: more than 24 weeks showed the strongest effects. Moderate intensity proved ideal, not too easy but not overwhelming you either. Exercising three or more days per week showed slightly greater reductions than once or twice per week, although both frequencies provided benefits.

Anxiety told a different story. Shorter programs of eight weeks or less were most strongly associated with reduced anxiety. Low-intensity exercise showed better results than vigorous activity. Once or twice a week produced slightly better results than more frequent sessions, although this conclusion comes from limited reviews.

These differences mean doctors can no longer just say “exercise.” A person who is drowning in depression may need a sustained, moderate program several times a week. Someone crippled by anxiety might do better with gentler movements a few times a week.

How exercise compares to standard treatments

The comparison with antidepressants and psychotherapy deserves closer examination. This doesn’t mean people should stop taking prescribed medications, especially those with serious symptoms or a clinical diagnosis. The findings suggest that exercise is worth serious consideration in treatment, particularly for mild to moderate depression.

Exercise brings practical benefits. It is generally inexpensive and accessible to most people. While improving mood, it also promotes physical health. Other research suggests that exercise may act through similar pathways to antidepressants, affecting chemicals in the brain that regulate mood, while potentially promoting the growth of new brain cells and reducing inflammation.

Beyond the biology, there is the psychological element. Setting goals, achieving them, and feeling capable in your own body again can change the way depression feels on a daily basis.

Why doctors don’t prescribe exercise

Despite strong evidence, exercise remains underutilized in clinical practice. Many mental health professionals lack training in exercise prescription and do not feel comfortable recommending specific programs. Health systems don’t have clear ways to direct patients toward exercise programs, the same way they can write a prescription or refer to a therapist.

On the patient’s side, depression and anxiety make starting an exercise routine overwhelming. Lack of motivation, exhaustion, anxiety about gyms or groups: all of this creates real barriers. Cost and transportation add practical challenges.

Researchers argue that doctors should prescribe exercise with the same confidence they have in traditional treatments. This means writing specific “prescriptions” specifying type, intensity, duration and frequency, just like instructions for medications. A student could thrive on an intramural sports team. A new mother might prefer a walking group with other moms pushing strollers.

The key is to tailor the exercise to the person and their specific mental health needs, then provide enough support to actually get them moving.

Disclaimer: This article is for informational purposes only and should not replace professional medical advice. Anyone considering exercise as a treatment for depression or anxiety should consult their doctor, particularly if they have been diagnosed with a mental health condition or are currently undergoing treatment.