The purpose of this study was to determine "The effect of Double Leg Bound exercise has an effect on the results of Leg Muscle Power for the Boys Volleyball Team of SMA Negeri 1 Dayun, Siak Regency. This research was conducted at the volleyball court of SMA Negeri 1 Dayun, Jl. KH. Ahmad Dahlan, Sialang Sakti Village, Siak Regency. This study uses one group, so this study uses a one-group pretes…