Authors: Neil Munro, James Dimmock, Sam Teague, Klaire Somoray

Why is this study important?

Depression and anxiety affect millions of people worldwide. While treatments like medication and psychotherapy are effective, many people face barriers, including cost, stigma, waiting lists, and side effects. Exercise has long been promoted as a treatment option, but hundreds of studies with diverse results make it unclear how much exercise is beneficial, who it helps most, and which type is recommended.

Researchers have conducted dozens of meta-analyses examining exercise for depression and anxiety. However, gaps remain in understanding effectiveness across age ranges and exercise parameters. Previous studies primarily focused on adult populations or included confounding factors such as chronic disease. Our study resolved this by conducting a meta-meta-analysis (a systematic review of all existing meta-analyses) to determine what the evidence really shows.

How did we go about this?

We analysed 81 separate meta-analyses on exercise for depression and anxiety, collectively including nearly 80,000 participants across more than 1,000 original trials – the highest level of evidence aggregation. We examined factors explaining variation in results: study populations (diagnosed depression or anxiety versus symptoms only, different age groups including perinatal women), exercise characteristics (aerobic versus resistance versus mind-body, supervised versus unsupervised, intensity and duration), and delivery formats (group versus individual). We used advanced statistical techniques to obtain the most accurate estimates of effectiveness.

What did the study find?

Exercise effectively reduces both depression and anxiety symptoms. We found moderate-to-large benefits for depression and small-to-moderate benefits for anxiety compared to inactive control groups.

Specific populations benefit more than others. Exercise showed particularly strong effects for diagnosed depression and anxiety disorders. For depression, the greatest benefits were in emerging adults aged 18-30 and postnatal women, especially significant given how underserved these populations are in accessing traditional mental health care.

Exercise type and delivery proved critical. Aerobic exercise (walking, running, cycling, or swimming) demonstrated the most substantial impact on both conditions; however, all forms, including resistance training and mind-body practices, reduced symptoms. Supervision and social context mattered enormously: greater reductions in depression were associated with group exercise and supervised settings, where professionals guide activity and participants gain social support.

Interestingly, optimal exercise varies by condition. For anxiety, short-term exercise (up to 8 weeks) at a comfortable to moderate pace was most strongly associated with improvement. This challenges the “no pain, no gain” mentality, suggesting consistency and appropriate intensity matching matter more than high-intensity workouts.

What are the key take-home points?

Exercise should be considered a legitimate treatment option for depression and anxiety, particularly for diagnosed conditions. However, simply telling patients to “exercise more” is unlikely to be effective. Structured, supervised exercise with a social component can have the highest impact. Exercising with others brings a communal compound effect.

For clinicians, referrals to specific programs matter more than general advice – group aerobic classes, supervised resistance training, or running programs rather than simply suggesting independent exercise. Social support and professional guidance can be critical.

Pay attention to emerging adults (18-30) and postnatal women experiencing depression – these populations showed particularly strong responses. For patients with anxiety, reassure them that shorter-term exercise can be highly effective.

Exercise works best as part of a comprehensive treatment plan. While effective as a standalone intervention for some, it can complement medication and psychotherapy. For patients hesitant about medication or facing therapy waitlists, supervised group exercise offers an evidence-based option to begin treatment immediately.

The message is clear: exercise-based interventions, in all formats and parameters, can help mitigate depression and anxiety symptoms. While specific approaches – particularly supervised, group-based aerobic exercise -show more potent effects, the most important step is getting started with physical activity in whatever format works for you.