I think what works for each person is something you just have to figure out. For a long time i only used the Aerobika sitting up. Then on a forum i read that someone's pulmonologist told her to use it also laying down and on each side. That has made a big difference for me. I lay down with my head slightly inverted and a pillow under my hips and then also on each side. i get what feels like all of the mucus out. But when i went to the dentist recently (two times) i found that after laying inverted for a long period of time in the dental chair, that even more mucus came up (they were understanding). I sometimes wonder if an inversion table would be a good idea once a week or so. But then there is the GERD issue so it would have to be done on an empty stomach. Has anyone heard of using inversion like that?