Effectiveness of a Theory-based Home-based Multi-component Exercise Training Among Older Adults With Type 2 Diabetes Mellitus: Study Protocol of a Sequential Mixed-methods Study

The goal of this clinical trial is to learn if a theory-based home-based multi-component exercise training works to prevent sarcopenia in older adults with type 2 diabetes mellitus. It will also learn about the safety of the theory-based home-based multi-component exercise training. The main questions it aims to answer are: * Whether a 12-week theory-based home-based MCE program is effective in decreasing the risk of developing sarcopenia, as well as improving physical activity, glycaemic control, muscle mass, muscle strength, physical performance, cognitive function, depressive mood, and quality of life among the Chinese community-dwelling older patients with T2DM. * What are the underlying mechanisms of the exercise intervention. Researchers will compare the MCE program to a waiting list control group to see if the MCE program works to prevent sarcopenia. Participants will: · Take a MCE program or a waiting list for 6 months