For me this is wonderfully true.
I have been a yogi for almost 10 years, and "learning to breath properly" was fundamentally transformational!
It's known in Yoga as Pranyama.
I can't recommend breathing work enough.
Now I can go all day deep breathing, and you can really feel the difference.
Right on, I have been practicing for around 6 years. It really does transform you on deep levels! Thanks for the support @dr00min.