["Journal of Applied Research in Intellectual Disabilities, Volume 39, Issue 4, July 2026. ", "\nABSTRACT\n\nBackground\nChildren and adolescents with developmental disabilities often encounter substantial barriers to physical activity. However, prior research has rarely provided a comprehensive understanding that integrates multiple perspectives.\n\n\nMethods\nWe conducted semi‐structured interviews with nine parents and seven sports professionals in South Korea. Data were analysed thematically using Braun and Clarke's six‐phase framework.\n\n\nResults\nIdentified barriers included inaccessible or poorly maintained facilities, societal stigma, insufficient instructor qualifications, fragmented administrative systems, and uniform, short‐term programmes. Parents also reported discomfort in inclusive settings and a preference for designated disability‐friendly spaces. Facilitators included government‐supported infrastructure, disability awareness training, family psychoeducation, structured instructor certification, and long‐term, individualised programmes tailored to individual support needs.\n\n\nConclusions\nParticipation in physical activity is shaped by interconnected physical, attitudinal, institutional, social, and programmatic factors. Addressing these challenges requires inclusive infrastructure, standardised qualification systems, emotional and informational support for families, and sustained, tailored programme development.\n\n"]