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This study aimed to draw a causal model of factors affecting exercise behavior and fat mass to fat-free mass ratio (FMFFMR) of the personal trainers based on Pender et al.’s framework. The sample was 480 male personal fitness trainers from 3 fitness centers. Exercise behavior questionnaire and Dual Energy X-Ray Absorptiometry were used to collect data. Confirmatory factor analysis and structural equation model statistics were analyzed with Mplus program. The results found that a causal model of factors affecting exercise behavior and FMFFMR of the personal trainers was not related to the empirical data (CFI = 0.91). Social support was positively highest causal factor affects to Commitment, Exercise behavior and FMFFMR. Fitness center business should develop behavioral management model of personal trainer according to the Social support causal factor.
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