There are generally three reasons for big breasts. I haven't seen the first one myself, but I have seen it on my cousin. Once I played ball with him, because it was hot, I took off my shirt and played with bare arms. Then I found that when it was exercising, its chest shook badly and almost caught up with the girl's C cup.
If your situation is the same as my cousin's, you can try the method I gave him before. The personal test is very useful.
This method needs an auxiliary tool, which is what we often call an arm stick. I don't know if you said that. It's just a stick with a spring in the middle and handles on both sides. You can hold it. When in use, just hold the handles on both sides with both hands, and then press them in the middle with your hands until you can't press them down, or press them all the way.
When using this arm stick, be sure to put your hands on both sides with your own belt when pressing down, otherwise the arm stick will fly out once your hands are exhausted. A friend of mine lost a tooth like this.
If you use frequency, you can do it according to my previous standards. Do three groups every day, one group of twenty, and the pause time shall not exceed 5 minutes. Moreover, the grip posture must be straight, and never hold it horizontally or obliquely, which may be relatively labor-saving, but it is easy to practice crooked muscles. Chest is bigger. If you practice crooked again, it's really a fairy who can't save you, so you have to ask for money yourself.
The second situation is the kind of muscular man, that is, the muscles exercised in the gym and so on. This kind of muscle is hard to lose, so you can only work hard on dieting and buying clothes, because once you stop exercising, your chest will swell like a balloon, but it will become bigger. You can eat fruit and reduce meat at night, and the latter can buy a bigger shirt when buying clothes, which can cover a little.
The last situation is the follow-up version of the situation just now, that is, what should I do if I used to exercise my muscles and then stopped exercising and my chest rose like a balloon? I've been through this myself. At that time, buying clothes in summer was the most annoying thing. It can be said that every store's clothes are tried on one by one. Unfortunately, the effect is very small, so I have to buy some sweaters to make do with it.
But after that summer, I succeeded in shrinking my chest. The secret of my success is running. Running around our community for more than a dozen times every night has been very effective for more than a month, and my chest has lost weight. Although I don't know much about science, running can really keep fit and lose weight. You can try it if you are interested.