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Introduction: As part of a national health policy to fight excess weight and obesity, the “Lycéen Bouge” program aims to fight against social inequalities in health among adolescents by improving their well-being and nutritional balance. The aim of this article is to present the intervention logic of this program and to identify the key functions that are essential for the project to function properly and to be transferable. Method: Data was collected through interviews with project officers, observation sessions in several high schools. A documentary analysis was also carried out. The data was then analyzed thematically, in a collaborative process with the project leader, in order to develop the program logic model. Results: The analysis and development of the logic model identified the program’s objectives and components, as well as six key functions. The key functions identified concern the format and co-construction of activities, local partnerships, high-school volunteering, social skills training and project length. Conclusion: In some respects, the program differs from the literature and the evidence and could therefore draw on it for improvement. These include the involvement of beneficiaries and the implementation of a comprehensive approach and a gender-sensitive approach, which would make it possible to reach more students.