A depression in the middle of the stomach is not a waistline, most of them are due to excessive abdominal fat, but it is not excluded that it is caused by exercise, excessive slimming and other factors. The waistline is generally composed of three muscle lines, usually without abdominal fat, and can be exercised in daily life to make the waistline appear. The vest line is because the middle and sides of the belly button three muscle lines and abdominal muscle combination shaped like a vest, so called the vest line. If you want to have a vest line, you can properly exercise exercise, such as sit-ups, flat support, knee roll abdomen, etc., can be a good exercise abdominal muscles, so that the vest line out. In the exercise should pay attention to grasp the correct exercise method, to avoid the bad exercise leads to muscle, joint injury, etc.. In daily life, a reasonable diet can help to show the vest line, should be low oil, low salt, rich in protein and vitamin food, try not to eat too greasy food, so as not to cause weight gain, affecting the vest line exercise effect.