The recognition of sports clubs (SC) as health-promoting settings is increasing, as well as the number of health promotion (HP) interventions implemented in this setting. However, minimal understanding of their development process and the persistent gap between theoretical knowledge and real-life practice is a major limitation to their implementation. This article describes a participatory research approach, implicating 29 stakeholders in sports and HP (6 HP researchers, 9 HP professionals, 6 representatives from regional and national sports organizations and 8 representatives from SC), leading to the co-construction of a health-promoting SC intervention. Stakeholders were mobilized through four stages: (i) analysis of effective programs, (ii) co-construction workshops, (iii) evaluation of relevance and acceptability, and (iv) beta-testing of a massive open online course (MOOC). A qualitative analysis was carried out on data collected through notetaking, recordings, transcripts, email exchanges and produced documents. This work led to the development of an HP intervention, including an MOOC, as well as a seven-step SC-tailored program. The convergence of theoretical knowledge and contextual real-life practice made it possible to respond to the specific needs and implementation problems encountered by SC actors and to develop acceptable strategies and tools.