Abstract
The purpose of this study is to propose an evaluation method for the ease of jumping with a jumping rope and consider the structure of it offering the ease of jumping. The rope jumping motion analyses with various rope were carried out to investigate a quantitative designing guide to ease of jumping. It was found that the hand rotation movement was a significant evaluation guide. The effect of different mass distributions of a jumping rope and the shape of a rotator on the ease of jumping were also investigated. It was shown that the possibility that the foot hangs to the jumping rope could change as the mass distribution of a jumping rope was changed and that the ease of jumping could be controlled by changing the shape of a rotator to a curved one.
