I think what you said is pretty close to the mark but people who practice it also use their toungue as a piston to force more air in. some use it some don,t but it can raise other issues, and would be considered i think as a fairly advanced technique when done properly. There are other stretches out there to make you diaphragm and ribcage more flexible. I don,t really pack so that is about as much as i know about it. Try the search function for threads as it has been discussed at leanght before pros and cons etc.
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