Weird question, but I was thinking about how a burp releases extra air you have trapped in your stomach. So if you're underwater holding your breath, to what degree could you muster up an extra smidge of "fresh" air by burping whatever you have available back into your mouth? And on the extreme end, what if you intentionally first tried to swallow air to store as much as possible?
I have bunions. Looking for a shoe that is comfortable.


