<![CDATA[Cardiorespiratory endurance, projected through Maximal Oxygen Consumption VO2Max, serves as a primary functional pillar for football players to sustain performance and match intensity throughout 2 X 45 minutes. This study aimed to analyze in-depth the effect of a High-Intensity Interval Training (HIIT) Running intervention program on increasing VO2Max among football players of Yasphi FC Tebaban. This research employed a quantitative experimental method with a One-Group Pretest-Posttest Design. The research population comprised all 23 active players of Yasphi FC Tebaban, all of whom were selected as the sample using a total sampling technique. The training intervention was administered over 6 weeks with a frequency of 3 sessions per week (18 sessions in total), with running intensity set between 85%–95% of Maximum Heart Rate (HRmax). The Multistage Fitness Test (MFT) or Bleep Test was utilized as the instrument to measure VO2Max. Descriptive statistical analysis demonstrated that the players' mean VO2Max value increased from 38.42 mL/kg/min (pretest, moderate category) to 46.18 mL/kg/min (posttest, good category), representing an average increase of 7.76 mL/kg/min or 20.19%. Parametric statistical analysis using a Paired Sample t-test yielded a calculated t-value (tcount) of 26.215, exceeding the critical t-value (ttable) of 2.074, with a significance level of p = 0.000 (p < 0.05). Consequently, it can be definitively concluded that HIIT Running training exerts a significant positive effect on enhancing the VO2Max of Yasphi FC Tebaban football players.]]>
