<p>Physical inactivity among older adults is a global health concern, necessitating effective interventions to promote physical activity and improve health outcomes. Literature related to intervention is reviewed, and key elements including theoretical foundations, scope, behaviour change strategies, and measurement methods were discussed. An intervention design proposal has been made that aims to encourage older adults proactively participate in physical activity and promote sustainable behaviour change. The intervention follows a bottom-up approach, incorporating participatory design principles and leveraging the social-cognitive theory. Design plays a significant role in the intervention design in order to make it more effective and sustainable. Future intervention design can follow a similar method to have a greater social impact.</p>