The overall goal of this project is to establish a hub to integrate implementation research for scaling up sustainable, evidence-based mental health interventions with research capacity-building activities for East Asia. Specific scale-up study aims include: Aim 1: Assessing readiness for implementing the evidence-based physical exercise intervention for improving mental health of older adults in participating provinces of Thailand; Aim 2: Developing the GTO-ThAI implementation support model through a pre-implementation case study and formative evaluation; and Aim 3: Evaluation of implementation strategies and clinical outcomes through a hybrid Type 3 randomized trial to test an evidence-based implementation support strategy (i.e., the GTO-ThAI model) that emphasizes a systematic process to address implementation barriers to the delivery of the evidence-based physical exercise intervention (PEI), compared with the existing standard administrative procedures for delivering the same PEI.