Despite the health benefits in older age, engaging older adults in fitness routines requires a thoughtful and subtle approach while designing tools for their adherence to health activities. Aesthetic and Ergonomic disturbances often contribute to product usage instability despite the excellent and competitive design. However, perceived usage compatibility in the initial stage of the idea plays a crucial role in purchasing a product that remains active even post-purchase. Furthermore, various degrees of complexity incorporated into the devices and instructions often create an imbalance between the cognitive and physical demands of the task and the resources available to the user. The final service to consumers is often hampered due to a lack of understanding of their requirements and preferences. This paper identifies the micro-determinants in understanding user engagement and their requirements. It associates the inclusive design approach, helping create products like wearable fitness trackers to serve a larger periphery of consumers, providing a sustainable experience.