What are the common signs that the lungs of the heart are trained as a result of exercise and physical labor?

When the heart and lungs are trained through physical labor and exercise, they have a number of characteristics. The lungs have more volume. This is especially noticeable in those people who are involved in running, swimming and various activities during which shortness of breath occurs. A trained heart beats more often during work, but it does it rhythmically, without interruptions and irregular systoles. But it must be remembered that improper exercise can harm the lungs and heart, worsening health.