The purpose of this study was to determine the effect of leg muscle strength training on athletes of the Karate-Do Indonesia Tambang institute. This study was conducted at Dojo Lemkari Tambang Jl.Cipta Karya, Pekanbaru, Riau. This study was conducted from August 2020 to September 2020 by implementing 16 meetings with 3-4 times a week. The population in this study were 10 athletes from the Karat…