Girls can get breast enhancement through exercise. The principle is to pad muscle groups directly under the breast and fat layer, which can play a similar role in filling silica gel, and the shape is better, which can reach the level of almost no sagging without underwear. At the same time, exercise can stimulate breast development, and a diet with high protein, tropical fruits and trace estrogen will be more helpful.
The degree of breast enhancement can probably increase by up to 2 cups, and then you can only have surgery.
PS: Class A cups can't be strengthened by strength training, because the breast and fat layer are too thin to cover the muscles. However, you can stimulate the growth of the breast body by weight-free exercise first.
When it comes to exercise, the position of the muscles that girls need to practice must be very accurate, because the surface area of the pectoral muscles is larger than that of the chest, so the pectoral muscles that are practiced outside the chest are completely destroyed, so the strength posture must be determined according to the individual's chest shape, and then the movements should be standard.