"Belly Breathing" - Yes...
I learned to do this when I was studying voice way back when.
My instructor explained it as, "watch how an infant breaths. They don't hold in their stomach, they let it drop when they breath in, allowing the diaphragm to fully expand.".
You may not look like a posing bodybuilder, but you'll get some good deep breaths! ;-)
Just be careful not to hyperventilate!
Belly - funny word.
Cheers - D