This requires the use of a spine mattress, also known as a flat mattress. Just lie on your back on its inclined plane, and sometimes you can move your head or raise your head. You can easily stick to it for about three hours at a time. The head-up mattress also has customized pillows, which can be used as ordinary mattresses. It can also be used with cylindrical pillows and the like. It is also doing supine cervical exercises. Please refer to!