A Multi-level and Mixed-method Impact Evaluation for the Jockey Club Elders Get Active Fitness Campaign

The goal of this clinical trial is provide a scientific evaluation on the impact of the Jockey Club Get Fitness Campaign to improve the physical capacity and health condition of the community-dwelling older adults after the COVID-19 pandemic. Participants will take part in any of the four care models: * a box of exercise equipment * a box of exercise equipment with verbal briefing * a box of exercise equipment and engage in the 8-week group-based exercise training * receive the wonderful box of exercise equipment and engage in the 8-week group-based exercise training together with the 6-week behavioral modification Participants with greater physical dependency, greater chronic disease burden or lower motivation for social engagement will take part in any of the three care models: * a box of exercise equipment only * a box of exercise equipment with verbal briefing * a box of exercise equipment and engage in the 4-session home-based exercise training, together with the 6-week behavioral modification