The mediating effect of physical fitness
This study verified hypothesis 2: Physical fitness plays a mediating role in the process of physical exercise affecting SWB.Firstly, Tai Chi exercise has a notable impact on the physical fitness of the aged, particularly in terms of improving their strength and balance, which is consistent with the results reported by Winter et al. [Weinecke et al. [Muscle strength and balance are crucial prerequisites and guarantees for the work and life of the aged and are the foundation for production, living, and participation in social activities. Some studies have shown that muscle strength and quality are strongly correlated with longevity and all-cause mortality [