In the Brittany region, the Ireps was tasked by the regional health agency with training healthcare professionals working in correctional facilities on health promotion. The goal is to foster a shared culture and encourage collaboration among these professionals, who, lacking established methods or tools, have struggled to implement a comprehensive health promotion program. After gathering feedback from the professionals, four training sessions were held in 2014, reaching thirty-one of them. The inter-facility meetings and the breaking down of silos were widely praised.