Running Out of Breath While Speaking?
This is why you run out of breath when you speak!
Especially if the language you currently speak is not your native language, you will carry over non-functional behaviours from that language.
For example, I used to speak the English language with Vietnamese mouth movements, which caused a heavy accent.
Same for this student of mine! The breathiness of the Mandarin language carried over to how he speaks English.
Do you use too much air per word?