If you lose weight, you will lose your breasts. Which flat-chested model do you think is not flat-chested? The chest is mainly composed of thymus and fat. All you can change is being fat. Exercise is the most useful and the easiest way is to wrap the chest with plastic wrap. Jump rope or run for more than 30 minutes each time, sweat and burn fat, and stretch your hands up for 30 minutes before going to bed at night.

Usually eat less beans, eggs, papaya, fast food, these will breast enhancement. But as long as you lose weight, your chest will naturally lose weight. It is not obvious whether you can wear a bra when running.