This is a sit-up roll-up device for home abdomen leg support, which is a fitness equipment for your health. Abdominal sports aid detachable device for body fitness strength training. Strengthen the abdominal muscles, shoulders, arms and back. Feature - Color: Black and blue. - Material: ABS. - Size: 21x13x7cm. - The body is lying on the floor mat, bending the knee to about 90 degrees, and placing the foot under the aid Sit-ups in straight legs can increase the burden on the back. The position of the hands is determined according to the strength of the abdominal muscles. The closer the hands are to the head, the more difficult it is to sit up. Beginners can lean their hands on the sides of the body. When the fit or physical fitness is improved, the hands can be crossed to the chest. Finally, you can also try to put your hands on the back of your head, but your hands should be placed on the shoulders on the other side of your body. Precautions: Practicing sit-ups, must vary from person to person. You can try to do it 5 times a minute, then slowly increase it until you reach about 50 times. Many women under the age of 30 are practicing for the purpose of preventing gynecological diseases. The frequency is preferably controlled at 60~70 per minute, which decreases with age. 25 can be done in one minute over 50 years old. It is. For those who have a certain fitness foundation, more is to achieve the purpose of strengthening the abdominal strength through practice, so as to ensure that about 60 times a minute.