I'm surprised to see something on this topic as I've never really thought of stomach breathing as something with health implications. Trained singers and some

I'm surprised to see something on this topic as I've never really thought of stomach breathing as something with health implications. Trained singers and some instrumentalists (those that require wind, i.e. not violinists) will already be very aware of this difference - using your diaphragm to breathe is emphasized early and often during lessons. I can recall my 7th grade choir teacher having a new kid in choir lay down on the floor to practice his breathing. It turns out it's quite a bit easier to breathe deeply with your diaphragm when laying on your back. You notice it almost immediately but it takes time to get used to doing it while standing up.