I purchased a gravity inversion table to help with my back problems......I love it, hangin upside down for a few minutes a couple of times a day has helped my back tremendously. Plus you get really high doing vape hits hanging upside down, lol.
Yesssss I have one too! They help my back a lot, and the fix works for hours. That's funny you say that about the vape because I once took a huge bong hit upside down, it was amazing.
Its really wild getting high upside down, especially when you flip back to the upright position....massive head rush, almost hallucinogenic. I even feel taller when i'm done and as you said it last for hours.
My brother bought himself a slant board and used it when ever he could for a few weeks to help him with a bad back. And yes he says it did help.