Radoslav Georgiev | P-Rehab, Exercise, Movement on Instagram: "Upper back stiff? Pain between your shoulder blades? If you keep stretching and foam rolling but the stiffness always comes back… you’re probably missing the real cause. This isn’t about “tight muscles”. It’s about silent upper-back stiffness that almost nobody checks. 🎥 Full breakdown is now live on my YouTube channel (go there if you actually want the fix, not temporary relief). 👇 Comment “upper back” and I’ll send you the full e