This study was conducted to determine the effect of fartlek training on endurance in runners at the Semarak Athletic Center. The data analysis methods used included a normality test and a homogeneity test. Hypothesis testing was performed using a paired t-test because this study compared two sets of data from the same group, namely the pre-test and post-test results. The results of the study showed a calculated t-value of 6.463 with a significance level of 0.000. Since the significance level is less than 0.05, H₀ is rejected and H₁ is accepted. Based on these results, it can be concluded that fartlek training has a significant effect on increasing the VO₂max of runners at the Semarak Athletik Center Club in Bengkulu.
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