I use one for situps so I can't really say anything about the back relief it does or doesn't provide. But for whatever it's worth, if I just hang there for a few minutes and then twist at the waist, my back pops like my spine is a xylophone and someone's running a mallet across the keys.
So in that sense I would think it could at least loosen a person's back up a bit. But who knows how long it would last once they stand back up and gravity sets in.
Really, the best part of an inversion table is shortly after you get it, when your lady friend suddenly gets all scientific and wants to know if your blood can flow to certain parts that are now upwards while you're hanging there. All downhill from there.
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