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â muscle strength is is difficult for people with low remarkably poor one and flexibility. â health maintenance, promotion, stiff neck and back pain prevention. â total length (cm): 70 â mass (g): 100 â silicon rubber Japan â Just continue to use a few minutes every day, stomach tightening, stiffness of each part is softened. â Since the good feelings in simple operation it will continue every day. â Because it is pocket-sized, you can carry anywhere. â Because it made of silicon, it can also be used in the bath. In addition, you can wash dirty. â it is possible to improve the stretching exercises and strength due to the load and moderate intensity. â exercise method is in abundance, you can exercise in many parts of the body.