Abstract
The purpose of the study was to determine the relationship between arm muscle strength and arm length with the results of the upper serve on volleyball extracurricular students of SMP 1 Kertek. The research design uses descriptive quantitative methods with the type of research included in the type of correlational research. The sample used was 16 students who took extracurricular activities. Data collection techniques are tests and measurements. Data analysis using correlation analysis using SPSS 20 application assistance. The results of the study are as follows. First, there is a relationship between arm muscle strength and the results of the upper service obtained by rcount of 0.769 and rtable (16 ; 0.05) of 0.497, so by looking at the interpretation table of the correlation coefficient, the level of the relationship is at a high level. Second, there is a relationship between the length of the arm and the results of the upper service which is obtained rcount of 0.548 and rtable (16 ; 0.05) of 0.497, so by looking at the interpretation table of the correlation coefficient, the level of the relationship is at a medium level. Third, there is a relationship between arm muscle strength and arm length with the results of serving on volleyball which is obtained rcount of 0.858 and rtable (16 ; 0.05) of 0.497, , so by looking at the interpretation table of the correlation coefficient, the level of the relationship is at a very high level
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