My undrstanding is it works best when you constantly shift the spine, it segments the discs up to 3mm. I have 3 that are dried up (black on MRI) and the one holding them up is always prolapsed. A study showed people in my situation considering surgeory, 77% avoided surgery via inversion vs only 22% via normal physio. Dont quote me though, not a Dr, and it really only works for certain back issues, very much like mine. You need blood getting back in carrying mositure. It also takes time.
