The purpose of this study was to determine the effect of different approaches, particularly Endurance Training (E), Endurance and Strength Training (EST) and Endurance Training with weighted vest (EWV) to the 3000- meter running time of adolescent boys. Twenty-six (N=26) young male participants underwent interventions in between two observations. Pre-test included a 3000-meter time trial in mass start, 20-meter Multistage Test and Body Fat Analysis using a handheld device. Results showed significant difference between pre-test and post-test scores of EWV in the 3000-meter running time. Despite no exhibited significant change among EST and E group, all scores from three methods were directed towards decreasing running time. Change in VO2max among the three groups is significant only for groups with strength-training protocols.