This research was motivated by the low physical fitness of students obtained based on observations and the results of the author's interview at SMA N 7 Kerinci which showed that students had poor learning habits, unfulfilled nutrition and the economic level of parents who were in the medium and low categories. The purpose of this study was to see how the direct influence or indirect influence between study habits, nutritional status and economic level on the physical fitness of students of SMA N 7 Kerinci. This type of research is quantitative research with a comparative causal approach with a sample of 30% of the existing population, namely 30 students taken using random sampling techniques. The research instruments used were questionnaire sheets, fitness tests of Indonesian students and body mass index (BMI) measurements. The data obtained will be analyzed using path analysis techniques (Part Analysis). The results of research and analysis show: (1) There is a direct influence of study habits on physical fitness, in Py1 of 0.316 or 9.98%. (2) There is a direct influence of nutritional status on physical fitness, in Py2 of 0.306 or 9.93%. (3) There is a direct effect of economic level on physical fitness, in which py3 is 0.461 or 21.25%. (4) There is no effect of study habits through economic level on fitness, in P-value of 0.289 > 0.05. (5) There is no effect of nutritional status through economic level on physical fitness, in p-value of 0.235 > 0.05. (6) There is an influence of study habits, nutritional status and economic level together on physical fitness with an Rsquare value of 0.399 or 39.9%.