In modern adolescent boys, 20% have the same breast development as girls, with too much estrogen and too little androgen.

Generally speaking, it will improve with age. There are two ways of human intervention:

One is to stimulate the secretion of testosterone through weightlifting training, and the best or only way is to squat with a barbell. There is no substitute for this, but with the help of Smith framework, safety can be guaranteed.

The second is to lose a lot of fat. The most realistic way to burn fat is to run on a treadmill at a speed of at least 7 kilometers per hour for more than 40 minutes. If you run more than 10000 meters on an empty stomach every day, 1 month can lose more than ten kilograms. 10kg is very difficult, so the diet control is very strict.