Schnitzler, ChristopheChristopheSchnitzlerLefèvre, LisaLisaLefèvre2026-05-222026-05-222026-05-01https://hdl.handle.net/20.500.12162/15736Physical inactivity among youth is a global crisis, disproportionately affecting students with special educational needs (SEN) who face systemic barriers to participation. This paper presents the Enviro Actif 360 project, an innovative three-stage research initiative in Switzerland that provides a blueprint for building the inclusive Physical Education (PE) of tomorrow. Stage 1 employed the Global Matrix 5.0 framework to conduct a comprehensive national mapping of physical activity promotion across 11 indicators. Results revealed a striking paradox: while Switzerland excels in providing supportive environments (Community and Environment: A-, School: B), behavioral outcomes are concerning, with sedentary behavior receiving a failing grade (F). Most critically, the study exposed a complete data void for children and adolescents with disabilities (CAWD), with all 11 indicators graded as Incomplete (INC), rendering this population systematically invisible. This empirical invisibility mandates a paradigm shift. Stage 2 will generate missing data through accelerometry and qualitative methods, giving voice to CAWD's lived experiences. Stage 3 will co-construct Universal Design for Learning (UDL)-based interventions with stakeholders. This sequential Diagnose → Listen → Co-Create model offers a transferable roadmap for transforming inclusion from rhetoric to evidence-driven reality, architecting a PE system designed for all students from the ground up.enType de référence::Article dans une revue scientifique