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Therefore, this review examines the role of physical activity (PA) in mental health during the online era; considering how different forms of online engagement relate to youth mental health, with regard to both the emerging downsides (through increasing sedentariness) and the potential for harnessing such platforms to improve PA and mental health, together. As a narrative review of an emerging field, we drew on nonsystematic searches of PubMed and Google Scholar alongside author expertise to integrate key findings and identify new directions. Two conclusions emerged. First, whether online time helps or harms depends more on content, context, and user characteristics than screentime, although converging (though still-developing) causal evidence points to displacement of PA, alongside disrupted sleep as a leading mechanism. Second, digital adoption itself has become an opportunity for promoting PA\/delivering exercise interventions, online, with growing evidence of benefits for depression, anxiety, and well-being. However, these tools also carry risks, including body surveillance, social comparison, and compulsive exercise. Furthermore, data on online PA interventions in clinical mental health populations is sparse but appear to favor blended approaches. Overall, we argue the coming decade\u2019s key challenge is embedding evidence-based PA promotion within young people\u2019s online lives.<\/jats:p>","DOI":"10.1123\/jpah.2026-0550","type":"journal-article","created":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T10:44:40Z","timestamp":1790937880000},"page":"1514-1524","source":"Crossref","is-referenced-by-count":3,"title":["Physical Activity for Youth Mental Health in the \u201cOnline Era\u201d: Risks, Opportunities, and Implementation Priorities"],"prefix":"10.1123","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0618-2752","authenticated-orcid":true,"given":"Joseph","family":"Firth","sequence":"first","affiliation":[{"name":"Division of Psychology and Mental Health, The University of Manchester, Manchester Academic Health Science Centre, Manchester, United Kingdom"},{"name":"Greater Manchester Mental Health NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, United 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