Crunches are effective in slimming the stomach, and need to be adhered to and with the diet, will achieve a better effect of slimming the stomach. Sit-ups can stimulate the lower abdominal muscles, so that the abdominal muscle strength. Through the consumption of abdominal fat, so that the belly fat reduction, to achieve the effect of effectively reducing the waistline. It is important to note that doing sit-ups should be adhered to for a period of time, and it is not effective in a short period of time. In addition to sit-ups, you should also add some other whole-body aerobic exercise, so as to increase the whole body’s metabolism, promote the burning of abdominal fat, to achieve the effect of slimming the stomach. At the same time should pay attention to diet control, drink more warm water, eat light food, eat more grains and cereals. Therefore, sit-ups have a certain effect on the thin stomach, but to adhere to the exercise, and then with other sports and pay attention to diet, exercise thin body.