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Fitness at anytime and anywhere With this sit up equipment, you can exercise whenever you want at home, office, not only in the gym. You can use them to intensify your muscles and build an ideal figure! Features: 1. Small size, not occupy space, lightweight for easy storage. 2. A button switch, start three seconds. Waterproof and moisture proof, safer to use. 3.Thick soft foam, soft and comfortable without hurting the feet. 4. Four gear height, free to adjust. Through the spring snaps freely adjust their comfort level. Suitable for the whole family. 5.The diameter of rubber thickened double suction cup reaches 8.66 inch to provide a larger suction cup area and higher stability. . How to use: Step 1.Choose smooth ground Step 2.Clean the floor suction cup Step 3.Sucker installation Step 4.Height adjustment Specification: Material: foam + stainless steel tube+rubber Total height: 10.23 inch