TABLE 4.

Bootstrap analysis of significance test of intermediary effect.

Influence path	Indirect effect		95% confidence interval		The ratio of total effect
		Boot SE	Boot LLCI	Boot ULCI
Total indirect effect	0.282	0.019	0.245	0.319	66.24
Ind1	0.078	0.012	0.054	0.102	18.25
Ind2	0.122	0.018	0.090	0.159	28.62
Ind3	0.082	0.011	0.061	0.105	19.37
Ind1–Ind2:	-0.044	0.023	-0.096	-0.000	–
Ind1–Ind3:	-0.005	0.015	-0.037	0.025	–
Ind2–Ind3:	0.039	0.024	-0.008	0.087	–

Ind1: Perceived social support→mental toughness→autonomous fitness behavior; Ind2: Perceived social support→exercise self-efficacy→autonomous fitness behavior; Ind3: Perceived social support→mental toughness→exercise self-efficacy→autonomous fitness behavior.