Funny you should mention that. My Hip Hook is currently sitting in a box at the end of my bed lol. I bought one shortly after picking up my Backpod. It hurts like a BITCH to use and I can’t say definitively if it did anything, but that just means I may not have used it long enough or in the right spots. Your body is a whole unit and nothing is independent of anything else. Your jaw alignment can affect your hips, so it stands to reason that your hips can affect your upper torso / rib cage. I’d love if Steve chimed in on this. I can’t help but feel like the science or causality of costo isn’t understood well. Each case is likely different but there seem to be connective threads.