The purpose of this study is to propose new marketing strategies for quite competitive fitness industry with analysis of relational benefits, relational commitment, customer loyalty of business fitness center. For this study, 350 questionnaires were given to Seoul and Gyeong-gi fitness center customers. Data were analyzed through, frequency analysis, exploratory analysis, reliability analysis and correlation analysis using SPSS Windows V 18.0 The statistical significance level was set at α<.05. The research results are as per the below. First, relational benefits had significant influence on relational commitment. Secondly, relational benefits had significant influ-ence on customer loyalty. Third, relational commitment had significant influence customer loyalty. Fourth, re-lational commitment mediated between the relational benefits and customer loyalty.