This study aims to analyze the effect of waist flexibility, Body Mass Index (BMI), and confidence on the accuracy of volleyball smashes. This type of research is quantitative associative with a path analysis approach. A total of 25 male volleyball athletes at UKM STKIP Muhammadiyah Muaro Bungo were used as research samples, who were recruited using purposive sampling. The waist flexibility instrument uses a flexiometer, BMI uses anthropometry, self-confidence uses a questionnaire, and the volleyball smash accuracy test. Data were analyzed using path analysis through structural model testing. The results showed: (1) there was a direct effect of waist flexibility on the accuracy of volleyball smashes (py1 = 0.285 or 8.12%), (2) there was a direct effect of BMI on the accuracy of volleyball smashes (py2 = 0.216 or 4.67%), (3) there was a direct effect of self-confidence on the accuracy of volleyball smashes (py3 = 0.622 or 38.69%), (4) there is an indirect effect of waist flexibility on the accuracy of smash through self-confidence (p31.py3 = 0.312 > py1 = 0.285 or the total effect 35.60%), (5) there is an indirect effect of BMI on the accuracy of smash through self-confidence (p32.py3 = 0.242 > py2 = 0.216 or the total effect 20.97%), and (6) there is an effect of waist flexibility, BMI, and self-confident simultaneously on the accuracy of volleyball smashes (Rsquare = 0.891 or 89.10%).