 This study examined the perceptions of physical education teachers regarding barriers and facilitators to physical activity among inactive adolescents in secondary schools. It found that there were 21 barriers to physical activity identified by the teachers, which included lack of time, lack of resources, and lack of knowledge about physical activity. Additionally, the study also identified four psychological capabilities, five reflective motivations for social opportunities, and one physical capability that could potentially hinder physical activity. Furthermore, the study found that most of the barriers were similar to those previously identified in studies involving children and adolescents. These findings suggest that the perspectives of children and adolescents are consistent when it comes to identifying barriers to physical activity. The study also provided insights into the experiences of inactive adolescents, such as the sources of behavior, intervention functions, policy functions, and behavior change tools that can be used for future behavior change interventions. Finally, the study concluded that the findings can be used to design interventions for inactive adolescents to help them reach recommended levels of physical activity. This article was authored by Richard Moore, Lee Edmondson, Maxine Grigory, and others.