Features: Practicle:A key switch, start three seconds. Waterproof and moisture proof, safer to use. Fuction:Self-priming bar seating, this self-priming stick to sit-ups is designed to free your hands and do the exercises yourself. Design:Third gear height, free to adjust. Through the spring snaps freely adjust their comfort level. Stable support:A rubber suction cup grips the floor firmly to provide a safe and stable training stand. Places:Wide range of use.Suitable for surfaces such as tiles, concrete, marble, wooden / wood floors. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material:Sponge Package List: abdominal curl*1