Features of double sit push up stand : Sit up bar Small size, not occupy space, lightweight for easy storage. A button switch, start three seconds. Waterproof and moistureproof, safer to use. Self-Suction Thick soft foam, soft and comfortable without hurting the feet. Sit-up equipment Four gear height, free to adjust. Through the spring snaps freely adjust their comfort level. Suitable for the whole family. Sit-up suction The diameter of the rubber thickened double suction cup reaches 8.66 inches to provide a larger suction cup area and higher stability. Play belly movement,stretching back,elbow plank,press-up,etc. Compact design, s-shaped curve, easy to carry, easy to use. It's perfect for home-based strength training. Upgrade bottom rubber sucker of this sit-up bar, provide strong suction, more secure and stable. 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: 1.8 Pounds Package Included : 1 x Push up Device