As a child I had chronic bronchitis.
Today, as an adult, despite excessively doing running and Judo for several years, I feel that I haven't reached my stamina maximum by far.
During my last pulmonary function 2 years ago, the doctor said, my lung capacity is below average, although I don't smoke and live a healthy life style. I assume, that are the consequences of my long-time lung-problems in my childhood.
So I was wondering, whether I could benefit from breath training (inspiratory and expiratory muscle training) using a device like that:
According to their description, they enhance "strength and endurance of the muscles used to breathe". Not only they improve medical conditions, such as short breath, but also the stamina so that you are able to perform better in sports.
Does anybody have any experience with such devices?