Self-suction : Self-suction thickened silicone sucker, strong suction, more secure and stable.Helping you roll belly movement, push-ups, side kick,sit-ups and other sports Soft And Durable: Made of high-quality foam, comfortable during exercise, and ankle protection to prevent injuries, ptotect the instep from pain Portable: Light weight and portable design,small occupation. The sit up bar is portable for a work out anytime,anywhere.light weighteasy to install and storage Adjustable: 2 gears can be adjusted, the whole family can use the fitness equipment.Great for home gym, work out Easy Installation: The foot sit up Bar is very easy for home installation without need any tools, only to find a dry and clean flat ground,press the spring buckle inward to adjust the height of the crossbar, press the black button up or down to release/ fix the suction cup.Before you can start your fitness please ensure it wouldn't move easily