No, you should learn a comprehensive fitness method. Leg lifts and sit-ups are aimed at abdominal muscles, but their function is to increase these muscles. In order to get rid of the fat in the lower abdomen, you must lose enough body fat before the fat in this area is burned. Usually, women need to lose 12% ~ 13% of body fat to make belly fat disappear, and men need to lose 6% ~ 7% of body fat to be effective. Cardiopulmonary exercise and a nutritious diet can help you get rid of this annoying fat. Some people worry that the weight-bearing training of abdominal muscles will make the stomach swell and the waist thicken, especially for women. This worry is a bit redundant. The purpose of weight-bearing training is to exercise the fast muscle fibers in the abdomen and let you have six obvious abdominal muscles. Runners especially want to have high-quality fast muscle fibers, because this sport requires maximum strength in a limited time. Slow muscle fibers ignite slowly, and strength can be maintained for a long time before fatigue. Although many professional bodybuilders and bodybuilders train abdominal muscles every day, this usually leads to overtraining. Therefore, unless you exercise your upper abdomen one day, exercise your lower abdomen another day. For the average person, it is best to exercise abdominal muscles for no more than 20 minutes at a time, three times a week (once every other day, such as Monday, Wednesday and Friday), and take a day off on weekends. The initial abdominal muscle training only needs two or three movements at most, and it is enough to do two or three groups, and the number can be increased or decreased according to the individual's weight. After training for a period of time and making progress, the number of groups can be increased, and the number of times can be increased or decreased according to the weight used in exercise. Therefore, abdominal muscle training is the best choice for 6 ~ 25 times each time.