1.The sit up bars are mainly made of high quality metal materials, which are sturdy and durable. great support for waist, abdomen, legs, body sculpting, lifting and strengthening muscle. 2.Upgrade support bar, thickened rubber suction cup and foam, make exercise more safe and comfortable 3.four modes of height to be chosen according to the practical situation. Press the spring buckle to adjust the height. Thick, soft foam grips are comfortable against your feet and prevent chafing. Height adjustable to meet different needs. 4.The fitness machine is compact and very convenient for storage and carrying wherever you go. 5.Suitable for smooth surfaces like tiles, marble, wooden floors, please keep the floor and suction cups clean.