♚Sit-up machine can adjusts to three different gears for any foot size by flexible spring buckle, helping to hold your feet in place during exercise. Sleeted super-elastic wear-resistant eco-friendly foam material, comfortable and safe, protect the instep from pain, as well as not hurt your foot. Small occupation, easy to install and disassemble, quickly assembly simply take a few minutes, convenient to use. Multi-function adjustable sit-up bar, three gear height is free to adjust through the spring snaps, meet different needs, suitable for a different crowd. Press the whole sit up bar and the handle at same time to fix the suction cup easily, no need of other tools.