Hello, landlord! A year ago, my situation was similar to yours. Later, I decided to practice my chest muscles and abdominal muscles. I do 20 push-ups and 30 sit-ups every morning and evening for 1 year. Now I'm not used to not doing it every day ~ hehe, now my stomach is gone, and my chest muscles are obviously seen. My whole body seems to have changed. I was really happy with the decision. I also heard friends say that they did 200 push-ups every day during the summer vacation, and their bodies really deformed after a summer vacation! In fact, there is no special way to practice chest muscles and abdominal muscles. I've read many medical books, all of which are written on them. As long as you stick to it every day, your chest muscles and abdominal muscles will be developed! In addition, you 13 years old, you should eat more at this age and let your family cook something delicious for you at home. It is also important to exercise your chest muscles and abdominal muscles when eating food. That's when I remembered that I eat 2 tons of chicken every week! Hehe, I hope you can insist at last. Nothing is impossible as long as you persist! ! This is all my personal experience ~~ O(∩_∩)O~ Thank you ~