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We used a convergent mixed\u2010methods design with quantitative data from adolescents (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200932) and qualitative data from adolescents (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200914), mentors (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200914), facilitators (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u20093), and school staff (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u20093). We assessed pre\u2013post changes physical activity, mindful eating, and social\u2010emotional skills with paired Wilcoxon tests and used content analysis to identify themes. DiscoverU was highly acceptable and demonstrated initial impacts on PA days\/week, peer cooperation, and social connection. Qualitative data indicated adolescents' experience with mentors was important to these outcomes. However, feasibility was limited by inconsistent attendance with 44%\u201352% of adolescents receiving the intended dose. DiscoverU's novel use of mentoring to integrate physical and mental health promotion was well\u2010liked by all involved parties. Strategies to enhance consistent adolescent attendance are needed to increase program feasibility.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/jcop.70137","type":"journal-article","created":{"date-parts":[[2026,8,5]],"date-time":"2026-08-05T18:35:16Z","timestamp":1785954916000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["\u201cDiscoverU\u201d: Formative Development and Mixed\u2010Methods Evaluation of an Afterschool Health and Well\u2010Being Mentoring Program for Adolescents"],"prefix":"10.1002","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7181-8315","authenticated-orcid":false,"given":"Katherine R.","family":"Arlinghaus","sequence":"first","affiliation":[{"name":"University of Minnesota School of Public Health Division of Epidemiology &amp; Community Health Minneapolis Minnesota USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kristen","family":"Stuenkel","sequence":"additional","affiliation":[{"name":"Columbia Heights Public School District Columbia Heights Minnesota USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jodi","family":"Gadient","sequence":"additional","affiliation":[{"name":"Columbia Heights Public School District Columbia Heights Minnesota USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3875-0539","authenticated-orcid":false,"given":"Adrianna N.","family":"Bell","sequence":"additional","affiliation":[{"name":"University of Minnesota School of Nursing Minneapolis Minnesota USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1039-0818","authenticated-orcid":false,"given":"Lenora P.","family":"Goodman","sequence":"additional","affiliation":[{"name":"University of Minnesota School of Public Health Division of Epidemiology &amp; Community Health Minneapolis Minnesota USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3365-9018","authenticated-orcid":false,"given":"Nancy E.","family":"Sherwood","sequence":"additional","affiliation":[{"name":"University of Minnesota School of Public Health Division of Epidemiology &amp; Community Health Minneapolis Minnesota USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9605-0931","authenticated-orcid":false,"given":"Barbara J.","family":"McMorris","sequence":"additional","affiliation":[{"name":"University of Minnesota School of Nursing Minneapolis Minnesota USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,5]]},"reference":[{"key":"e_1_2_11_2_1","unstructured":"Afterschool Alliance.2022.Where Did All the Afterschool Staff Go? 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