Choir professor here!
When you inhale, what you are actually doing is asking your diaphragm to move down. It’s attached to the base of your lungs, so as they expand they create a low pressure area. Air gets sucked into the area, which is how you breathe.
When you *really* breathe in, like for singing, the diaphragm moves a little more. The lungs can only expand so much because you have ribs and other organs in the way. To make more room, your diaphragm pushes down until it’s gets to a part of your body where there aren’t any bones. This pushes out some organs and your belly.
Incidentally, if you’re having trouble doing this, lie on a flat surface. Your body does this naturally when you’re lying flat.
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