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The potential for implementing structured behaviour modification strategies to enhance risk-reducing clinical outcomes is widely recognised. The active participation of clients in the discussion and care process is crucial for optimising intervention outcomes and enhancing individuals\u2019 motivation to adopt and maintain healthy behaviours. This study therefore aims to evaluate the effectiveness of a physical activity promotion programme based on the goal attainment theory in relation to emerging adults\u2019 body composition, using a face-to-face and e-health blended interventions.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods and analysis<\/jats:title><jats:p>A two-arm, double-blind, randomised, controlled study will be conducted in 114 university students aged 18\u201325 years with physical inactivity. The intervention assignment will be blind to study participants, outcome assessors and study statisticians. A goal achievement theory-based physical activity promotion programme is developed in this study, which is a 16-week, face-to-face and e-health-blended physical activity promotion intervention. After informed consent, participants will be randomly assigned to either a control group or a treatment group before the start of the study. The primary outcome is body composition (ie, skeletal muscle mass, body fat mass, body mass index and body fat percentage). Other outcomes include physical activity level, goal attainment scale scores, exercise self-efficacy and motivation level, which will be assessed during the intervention (every 4 weeks) and at the 1\u2009month follow-up. Continuous variables have means and SD, while categorical variables have frequencies and percentages. Independent-samples t-tests will be used to compare continuous variable changes. \u03c7<jats:sup>2<\/jats:sup>tests will be used to compare categorical variable changes. Based on the baseline scores, analysis of covariance will compare the follow-up results.<\/jats:p><\/jats:sec><jats:sec><jats:title>Ethics and dissemination<\/jats:title><jats:p>This study was approved by the Ethics Committee of Hangzhou Normal University (ratification date: 14 November 2022, 2022059). The results of the study will be submitted for publication and dissemination in a peer-reviewed journal.<\/jats:p><\/jats:sec><jats:sec><jats:title>Trial registration number<\/jats:title><jats:p><jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"clintrialgov\" xlink:href=\"NCT05697679\">NCT05697679<\/jats:ext-link>.<\/jats:p><\/jats:sec>","DOI":"10.1136\/bmjopen-2023-076123","type":"journal-article","created":{"date-parts":[[2023,10,5]],"date-time":"2023-10-05T16:00:37Z","timestamp":1696521637000},"page":"e076123","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":4,"title":["Effects of a physical activity promotion programme on body composition in emerging adults with physical inactivity: a study protocol of a randomised controlled trial"],"prefix":"10.1136","volume":"13","clinical-trial-number":[{"clinical-trial-number":"nct05697679","registry":"10.18810\/clinical-trials-gov"}],"author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1543-6205","authenticated-orcid":false,"given":"Tao","family":"Xu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuexian","family":"Tao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rong","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Garry","family":"Strachan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xintong","family":"Cai","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chengyi","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2023,10,5]]},"reference":[{"key":"2023100509001465000_13.10.e076123.1","unstructured":"Dishman RK , Heath G , Schmidt MD , et al . 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