The increasingly demanding psychosocial working conditions in Swedish public sector workplaces call for implementation of workplace health promotion (WHP) interventions. There is a need to increase first-line public sector managers’ capacities for health-promoting leadership. The purpose of this paper is to investigate first-line managers’ experiences of participating in an intervention aimed at strengthening health-promoting leadership. More precisely, the aim is to study what obstacles and prerequisites the intervention have for their learning processes to become health-promoting managers.