<![CDATA[This study aims to determine the effect of extensive interval training and fartlek training methods on improving the cardiovascular endurance of soccer athletes. Cardiovascular endurance, as measured by VO2max, is a fundamental physical component in soccer because it determines an athlete’s ability to maintain optimal performance throughout a 2 x 45-minute match. Good endurance allows players to perform repeated high-intensity activities, such as sprinting, pressing, and rapid changes of direction, while maintaining concentration until the end of the match. This study used an experimental method with a two-group pretest-posttest design. The study sample consisted of 22 U-16 soccer athletes who were divided ordinally into two groups: an extensive interval training group and a fartlek training group, each consisting of 11 athletes. The test instrument used to measure cardiovascular endurance was the Yo-Yo Intermittent Recovery Test Level 1 (YYIR1). Data analysis was carried out through normality tests, homogeneity tests, paired sample t-tests, and independent sample t-tests to determine differences in effects between groups.]]>
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