First of all, this person's breathing is relatively smooth, because the lungs are mainly used for breathing. If the lungs are particularly healthy, then breathing will be particularly smooth. However, if there is something wrong with the lungs, then everyone will often feel particularly uncomfortable breathing and always feel that the lungs can't get out before inhaling. Therefore, when people have nothing to do, they can go to the gym to exercise. Swimming is a particularly good sport. Frequent swimming will make this person's lung capacity bigger, and he will breathe more smoothly in the long run.
Then, people with healthy lungs don't cough often. In daily life, you may occasionally see your uncle who smokes often cough, and when he coughs, he will spit out thick phlegm. This is because he often smokes, which has greatly damaged his lung function. The reason why he often coughs is because his lungs remind him that if he doesn't go to the hospital for examination, this person's lungs will have great problems and pneumonia is likely to occur.
Finally, this person's lung capacity is relatively large, because as long as the lungs are healthy, the lung capacity will be relatively large and the muscles of the heart will be particularly strong. If you want to improve your vital capacity, as mentioned above, you should exercise every day when you are free. As long as we persist for a period of time, there will be obvious improvement. I hope everyone can have a healthy lung!