Yes, but you have to master the degree. First of all, a girl's cup is determined by many factors, and the innermost one is muscle. If you practice chest muscles, the muscle fibers here will thicken, thus increasing the height of the base. In the middle is the mammary gland, which relies on natural genes. Some are big and some are small, but they all develop twice during lactation, which means they have great potential. There is also fat in the middle of the breast. If you are fat, it may get bigger here. If there is less fat here, you will get fat elsewhere. Finally, if the breast ligament is strong, it can make the breast upturned and the cup will be big. It's good to be a woman. Chest muscles will enlarge the cup to a certain extent, but once you exercise, you will consume the thickness of the fat part, that is, it will only get smaller and smaller. Don't try it easily without a professional fitness instructor.