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Boxer is a martial arts sport that originates from Indonesia. Boxer is the same as other martial sports that require speed, agility, reaction and great power. A common problem that often occurs in young athletes is the difficulty of developing the speed of reaction of the arms and legs. This study examines the role of Speed, Agility and Quickness (SAQ) exercises on the reaction speed of the arms and legs. The aim of this study was to determine the effect of the treatment of the SAQ training program on the reaction speed of the arms and legs of junior athletes in the boxer martial arts branch. The research method is a pretest-posttest experimental method with Equivalent time-series design. This study was carried out through repeated intervals of research and measured at the 9th and 18th treatments. The population of this study were 18 junior athletes of MAN 2 Medan, and 18 junior athletes of MAN 1 Medan. The sampling technique used random sampling and the sample used is 12 young athletes. The instrument used was the Nelson Foot Reaction. Data analysis techniques used the t-test with a significance level of 0.05. The results of this study concluded that there was a significant effect of SAQ training on the reaction speed of the arms and legs.