Abdominal muscles are divided into rectus abdominis and oblique abdominis. Usually, the six or eight blocks we talk about are rectus abdominis, which is divided into three areas: upper, middle and lower. The two pieces below the pectoral muscle you mentioned are the upper part of rectus abdominis. In this part of the exercise, you can use up-tilt sit-ups, as shown in the figure. There is a saying that abdominal muscles are not crooked. The arrangement of rectus abdominis is not exactly the same as human appearance. This is related to heredity. Besides, not everyone has eight or six dollars, like Ronnie, a top bodybuilder. He exercised for 20 years and won eight times. It should be said that Mr Olympia has never tried the abdominal muscle training method, but his abdominal muscles are only four, but they are full. Balance training of sit-ups can only correct the fullness of left and right muscles. Asymmetry can't be adjusted, just like no amount of beauty can change a person's face unless you have plastic surgery. The latest bodybuilding industry also has two methods: 1, to correct the symmetry of abdominal muscles by surgery. 2. Implant genes that can make muscles symmetrical-that is, genetically modified muscles. However, these two methods are only used by a few professional bodybuilders, and the industry does not agree. After all, there are differences to have different aesthetic feelings. Bodybuilding is the beauty of self-characteristics, not the unified assembly machine on the production line. If everyone's abdominal muscles are the same, it would be terrible ~O(∩_∩)O haha ~ Come on ~ just exercise.