<![CDATA[The Physical Education, especially flexibility exercises still used manual training tools and had almost not been touched by computers or information technology, especially body flexibility. Researchers wanted to know about (1) Did exercise using Jo-Klimah hardware affect the flexibility of Madrasah Ibtidaiyah students’ body? (2) Did back-up exercise affect the flexibility of Madrasah Ibtidaiyah students'?, (3) Was there a difference of body flexibility between exercises using Jo-Klimah hardware and back-up exercises for madrasah ibtidaiyah students?. This research used a quasi-experimental method with the Posttest-Only Control Group Design. The population in this study were Madrasah Ibtidaiyah students in Tulungagung with a range of 10-11 years, male gender, the sampling method used simple random sampling so that eight Madrasah Ibtidaiyah were obtained as samples.  The first result of the research, it showed that training using the Jo-Klimah hardware had a significant effect on the body flexibility of primary school students with a sig value of 0.001 (<0.05). The Second, the back-up exercises also significantly affected the body flexibility of primary school students with a sig value of 0.492 (<0.05). The third, the anova analysis showed that there was a significant difference in body flexibility between exercises using the Jo-Klimah hardware and back-up exercises for primary school students with the results of the anova test obtaining a value of 0.000668 <0.05. The Students who were doing exercises using the Jo-Klimah tool were very enthusiastic and motivated. Jo-Klimah physiologically caused muscles to stretch and increased the range of motion (ROM). The increase due to back-up training was not as high as the exercise using Jo-Klimah caused by the monotonous form of exercise so that students feel bored and there was no challenge.]]>
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