This study aims to determine the effect of circuit training on aerobic endurance (VO2 max) for the men's volley ball team at SMA Negeri 2 Kuok. This research was carried out in the Field of SMA Negeri 2 Kuok, carried out in March-August 2021. This study used one group, so this study used a one-group pretest-posttest design approach. The population in this study amounted to 12 people consisting …