I can’t tell you how many times I’ve thought to invent a device like this:
Questionable claims? Yes (”Waist size is reduced an average of 2 inches in women who improve their posture”?).
Exercises of questionable value? For most, yes (although very deconditioned people will see improvement doing exercises of even little or questionable value).
Dubious fashion sense? Indeed (a “stylish pendant”?).
But it is definitely a nifty idea. Hope that MSRP goes down a little, though.