<![CDATA[Endurance is a critical physical fitness component for judo athletes, as competitive judo demands repeated explosive movements requiring optimal aerobic and anaerobic capacity. This study aimed to determine the effect of circuit training on endurance improvement of judo athletes at Al Jabbar Judo Club, Tuban Regency—a developmental-level club context that remains understudied in the existing literature. A pre-experimental one-group pretest-posttest design was employed. Thirteen athletes (4 male, 9 female) were selected through purposive sampling. The bleep test (multistage fitness test) was used to measure VO2max, while push-up, sit-up, and half squat tests assessed supporting components. The circuit training program comprised 16 sessions over five weeks (eight stations). Data were analyzed using the Shapiro-Wilk normality test and paired sample t-test. Mean VO2max increased significantly from 24.92 ml/kg/min (pretest) to 29.00 ml/kg/min (posttest), a gain of 4.08 ml/kg/min (16.37%). The paired sample t-test yielded t = −21.22, p = 0.000 (p < 0.05), with a large effect size (Cohen’s d = 1.30). Circuit training significantly improves endurance in developmental-level judo athletes. These findings provide evidence-based guidance for coaches and practitioners working in regional club training environments.]]>
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