My stomach is not good. I have been practicing in the gym for a month, but I haven't seen any muscle growth. I am very distressed. I work hard every day, but it doesn't work. Can you tell me what to do? Clear lines between muscles are called muscle separation in professional bodybuilding, which is the key condition to judge the level of a bodybuilder. Your condition may be caused by too thick sebum. Because you have too much subcutaneous fat, you can cover the gap between muscles. Another point is that you can use some special exercises to practice muscle lines, such as using birds on your shoulders, chest pliers or butterfly machine on your chest, sitting back and holding your head up and chest out. Anything. It should be noted that the bodybuilders you see in the picture books are not only practicing, but also not so good in the off-season. They can only achieve this degree of separation by controlling water and salt near their competitors. As a junior enthusiast, I mainly trained large muscle groups at the beginning, because of the continuous growth of muscles and the thinning of sebum, the degree of separation will gradually appear. I wish you success!