The goal of this clinical trial is to find out if newly developed, culturally adapted educational videos-sent through a mobile messaging app-can help people with coronary heart disease do better in a home-based cardiac rehabilitation program in Malaysia.

The main questions it aims to answer are:

• Do the educational videos help participants improve their fitness?
• Do the videos help participants better understand heart health and stick to a healthy lifestyle?

Researchers will compare the educational videos to existing standard educational materials to see if the video-based education is more helpful for supporting rehabilitation at home.

Participants will:

• Take part in a 12-week home-based cardiac rehabilitation program
• Receive either educational videos or standard education materials
• Meet with the cardiac rehabilitation team every 4 weeks
• Complete a treadmill exercise test, blood tests, and questionnaires before and after the program.

Inclusion Criteria:

• Diagnosed as any form of ischaemic heart disease;
• Classified as low to moderate risk based on American Association of Cardiovascular and Pulmonary Rehabilitation (AACVPR) criteria through Exercise Stress Test (EST);
• Cognitively intact and able to provide informed consent;
• Literate and capable of utilising educational material;
• Able to use and operate a smartphone with an exercise activity tracker (EAT).

Exclusion Criteria

- Classified as high risk according to the American Association of Cardiovascular and Pulmonary Rehabilitation (AACVPR)

IPD will not be shared with outside researchers, as the informed consent forms for this study did not include a provision for future sharing of individual participant data beyond the initial research team. Therefore, IPD cannot be shared to protect participant autonomy.

All of the parties are masked except the treating physician and non-participating investigator (a staff nurse), who maintained the allocation concealment list throughout the end of the trials.