Fitness includes not only the time in the gym, but also the time outside the gym. It can be said that the time outside the gym is more important. Usually, we must pay attention to eating a high-protein and low-calorie diet, such as fish, beef and chicken breast. Avoid junk food such as pork, ice cream, Coca-Cola, beer, KFC, McDonald's, etc., because a big hamburger may ruin the results of your aerobic exercise in a day.
Only by controlling diet can the body's fat content be reduced, and then the muscle lines will be clear. If you don't pay attention to your diet, you will always be a fat man with muscles as developed as fat.