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The verification and the design improvement of weight-training machines were performed. This research was carried out with computer simulation using the musculoskeletal model of the human body. The main topic of this research is the improvement of an arm-curl machine. Also the improved exercise effects were observed in this paper. The existing exercise which moves the scapula on the axis of the elbow with raised forearm is effective for only Biceps. We suggested the new concept arm-curl machine that also raises the scapula after raising the forearm to be effective for Triceps and adjacent muscles. The exercise effect to the Biceps and Triceps was verified in the partⅠ, that to the non-adjacent muscle such as Lattismus Dorsi was verified in the partⅡ of this study. The analysis with computer simulation using the musculoskeletal model could be helpful to develop improved healthcare machines with reduced price and time.