Effect of Plyometric Jumping Jack and Tuck Jump Against Strength and Leg Muscle Power in Martial Arts Athletes at Kostrad Malang

The purpose of this study was to determine the effect of jumping jack and tuck jump exercises on leg muscle strength and power. The subjects of this study were the Pencak silat athletes of the Branch Kostrad Company-C, totaling 30 people who were divided into three groups with ten people in each group and carried out for six weeks. The type of research used in this research is quantitative with an experimental method. The research design used a Non-Randomize Control Group Pretest-Posttest Design. Data collection on leg muscle strength was carried out by testing the Leg Dynamometer and leg muscle power using the Jump MD tool at the pretest and posttest. The results of the study were measured using paired t-test and LSD tests. The paired t-test obtained sig <0.05 on the variable leg muscle strength and leg muscle power. The results of the LSD test show that jumping jack exercise has more effect on the ability of leg muscle strength and power. In conclusion, jumping jacks and tuck jump exercises can improve leg muscle strength and power, where jumping jacks practice has more effect on the knowledge and stability of the leg muscles.