Need some help with fire breathing

Body: 

Okay....I've watched the Prolapse First Aid - great video with awesome information. Fire breathing...without going to much into detail, I've watched the demonstration again and again. My question is this. On the exhale, are you sucking in the stomach or tucking the tailbone under? I have been trying to NEVER tuck my tailbone, but does this move require it? Otherwise, how do you suck in your stomach while exhaling? Thanks!

Hi Militarymom1,
Think of it as pulling your belly button to your spine. In breath, really filling your belly and arching your back,and then out breath through pursed lips, pulling belly button to spine. Your back will round slightly, but the angle in which you are holding your body should not cause a complete tucking of the tail bone.
I have even gone so far as to stick a finger or two inside my vagina to get a feel of how this suction works, and with the correct out breath, I could feel the suction pulling on my fingers. Its not that you have to do that, but I just wanted to see what the suction actually flt like.