RE-AIM Online Training is a web-based training module, takes approximately 45 minutes to complete and allows participants to start and stop as necessary. The training provides instruction and case examples to illustrate each of the five dimensions of the RE-AIM framework: Reach, Effectiveness, Adoption, Implementation, and Maintenance, with specific application to policy/environmental change interventions. RE-AIM is useful for planning new interventions, adapting existing interventions, and designing evaluations that assess the potential public health impact of interventions. This web-based training encourages public health practitioners to consider how to improve the sustainable adoption and implementation of effective interventions. The online module and related training materials are available here.