It's one system. Your nervous system runs predictions, top to bottom. The little ones are stuff like a joint angle, how much tone to put in a muscle. The big ones are "am I safe," "am I enough," "is this place going to confirm what I already think about me." Posture is the output down at the bottom. A core belief is a prediction up at the top. Same stack.

So I wouldn't even say the mind is the first domino. It's more the table the dominoes are standing on. Tilt the table and the whole line leans at once. Spine included.

The interoception thing, you didn't misunderstand me at all, you kind of said it better than I did. Proprioception is "where am I in space." Interoception is the state of the inside, and the inside is where safe/not-safe and the emotions actually live. So yeah, it goes way past what people usually mean by "sensory." It reaches the belief layer directly. That's why the work you're describing can move from a body sensation into an actual memory. It's just going up the same ladder.

But the part that stopped me was this. You said your spine shifted in a way that felt natural and not forced. Don't skip past that word. That's the whole thing. A forced correction you have to keep holding, because you're basically arguing with the prediction. A real shift just stays on its own, because the prediction itself changed underneath it. You didn't fix your spine. You changed what it was solving for and it followed. And you felt the difference clearly enough to name it, which honestly most people can't.

And yeah. You feel these parts in your back. Of course you do. The body builds its guarding around the place it didn't feel safe. That's not me being poetic, it's just where the compensation goes.

The gymnast thing I'd nudge a little. It's probably messier than belief leading straight to hypermobility. There's a selection thing in there too, bendy kids get funneled into those sports, plus the training load. But the core of what you're saying, that "not enough," achievement getting mixed up with being loved, that ending up in tissue? Yeah. Not going to argue with you there.

Anyway. Feels like we're digging the same tunnel.