1.The sit-up bars are mainly made of high quality metal materials, which are sturdy and durable.Excellent support for waist, abdomen, legs, body sculpting, lifting and muscle strengthening. 2.Leveling support bar, thickened rubber suction cup and foam, make exercise more safe and comfortable 3.Four height modes to choose according to the practical situation. Press the spring loop to adjust the height. The thick and soft foam handles are comfortable against your feet and avoid friction. Adjustable in height to suit different needs. 4.fitness equipment is compact and very convenient for storage and transportation wherever you go. 5.suitable for smooth surfaces like tile, marble, wooden floor, please keep the floor and suction cups clean.press the black button up or down to release/fix the suction cup.