Participants in the intervention group will participate in a 6-week Connect Active Program (CAP). Young participants will be the pioneers and take the initiative to change their inactive and sedentary lifestyles by including exercise into their daily routines about once a week, at least 45 minutes each time. For instance, they could organize family field trips to waterfront parks or involve their older family members in their favorite sports. All walking activities included in the study should be done with the Nike Run Club App for record and outcome measures. For other activities in CAP, participants will use other apps following that week's topic. For instance, they will use Google Maps to search for the best routes to their destinations; transportation apps such as Kowloon Motor Bus, Long Win Bus, and Mass Transit Railway apps to search for stops and exits.

Participants in the control group will be provided with a leaflet as usual care. The pamphlet contains information about the benefits and some instructions for walking exercises for older adults.

Younger adults will help older adults increase their digital literacy, skills, and desire to exercise and become more physically active via the proposed intervention. The Connect Active Program will consist of two components: walking exercises and mobile apps.

It is initially created to assist in the examination of cardiopulmonary patients developed by the American Thoracic Society. It is a light-intensity exercise test to evaluate the aerobic capacity, endurance and oxygen saturation.

To assess mobility, movement, static balance and dynamic in people with musculoskeletal impairments, conditions related to aging, quality of life, and pain. The instructions are given as standing up from a chair, walking 3 meters, turning, and back to sit.