Sit up device is made of mild steel pipe and thickened foam cotton, comfortable and durable. Easy to install and convenient to use .small in size and easy to carry and use.There are 4 height adjustment functions, suitable for all men and women. Sit up bar can help you exercise many kinds of parts, suitable bird movements, high lift lower limbs, bridge hips, support lateral extensions, push-ups, sit-ups, lean over, flat support. Light weight and portable machine : You can use it at home, office or travel to exercise and shape your body