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- This study aims to determine the effect of interval running training on the level of physical fitness in students of the Kaludan Kecil State Elementary School. The research method used is the pre-experiment design method. The population in this study were all students of SDN Kaludan Kecil, amounting to 24 people consisting of male and female students, while the samples in this study were 24 people, consisting of 12 sons and 12 daughters with sampling techniques using total sampling techniques .The results showed that the pretest variable level of physical fitness in students of the Kaludan Small Elementary School students obtained an average = 15.17 with a standard deviation = 1.633. Whereas in the posttest variable the level of physical fitness of the students of the Kaludan Kecil State Elementary School students obtained an average of 18.25 with a standard deviation = 2.069. T-test results obtained t count = 18,206> t table (23; 0,025) = 2,207, or with Sig. (2-tailed) = 0,000; it turns out that Sig. (2-tailed) <0.05 thus the tcount is significant. The conclusion is that there is an effect of interval running training on the level of physical fitness of students at the Kaludan Kecil State Elementary School