Body inflation

I have been thinking about the same thing as well! ...but have no awnser.

Here are three guys on youtube who does it

first guy:




second guy:


third guy: (does it those medical tubes that go tough the nose)
?t=17m15s

i have tried myself to swallow a tube but its impossible...

With a little patience and numerous attempts I have now successfully figured out how to suppress my gag reflex and insert the hose