85KiB, 370x510, image.jpg View SameGoogleiqdbSauceNAO Anonymous Mon 02 Mar 05:11:53 2020 No.11433183 ViewReplyOriginalReport Quoted By: >>11433225 what is the science behind the abdominal vacuum? does breathing all your air out and sucking in the abdomen create an actual internal vacuum? does it push the organs up, out of the way of the abdomen?