I've not tried full body inversion and think it would be, for me at least, hard on my back. I did have success, years ago, with the Orthopod Invertabod thing that a physical therapist recommended after I herniated four discs in my lower back. I like the Orthoped thing because you invert from the groin area so just the upper body is inverted and it doesn't put stress on the ankles or the rest of the body. What I didn't like about the Orthopod is it wasn't tall enough for my body so my hands rested on the floor. A friend built a small platform for it so that I could get a full stretch without touching the floor and I used it daily for a few years which, along with other therapy, helped me avoid back surgery or the then-popular papain-injections, which have since turned out to look like a really bad idea.