Physical activity undertaken 3 times per week improves depressive symptoms in young people over the age of 13 with a diagnosis of mental illness. 

Recchia, F., Bernal, J. D., Fong, D. Y., Wong, S. H., Chung, P. K., Chan, D. K., … & Siu, P. M. (2023). Physical Activity Interventions to Alleviate Depressive Symptoms in Children and Adolescents: A Systematic Review and Meta-analysis. JAMA pediatrics.

https://jamanetwork.com/journals/jamapediatrics/article-abstract/2799811?guestAccessKey=78f88c44-0313-4447-8ca0-35fdb748784f&utm_source=silverchair&utm_medium=email&utm_campaign=article_alert-jamapediatrics&utm_content=olf&utm_term=010323