Self-suction : Self-suction thickened silicone sucker, strong suction, more secure stable.Helping you roll belly movement, push-ups, side kick,sit-ups other sports Soft Durable: Made of high-quality foam, comfortable during exercise, ankle protection to prevent injuries, ptotect the instep from pain Portable: Light weight portable design,small occupation. The sit up bar is portable for a work out anytime,anywhere.light weighteasy to install 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 clean flat ground,press the spring buckle inward to adjust the height of the crossbar, press the black button up or down to release or fix the suction cup.Before you can start your fitness please ensure it wouldn't move easily