I have a teeter’s hangup inversion table. Best thing I ever got. Had back pain my whole life, no more.
I have a huge, heavy metal gym grade one I got at a thrift shop years ago.
It’s too big for the house so it’s out in the back yard.
It really does work but during rain or snow, I can’t use it.
Someday I’ll get one of those smaller indoor ones.
They do actually help.