Through the combination of pulleys, let the children experience that different combinations of pulleys will change the pulling force. The product can be used alone or in competitions with multiple people. The training intensity can be adjusted according to the size of the child, which can effectively exercise hand muscles, increase abdominal muscles, enhance physical fitness, and allow children to get effective exercise. The child can sit in the position and let other children pull the rope hard to lift themselves vertically. Thereby promoting children’s understanding of structural mechanics.