Can’t Reach Behind Your Back? It’s Not Just Flexibility 💥 If this shoulder mobility test stops you cold — or feels tight, pinchy, or just off — you’re likely missing two major piecesof shoulder function. This isn’t just about stretching. It’s about how your shoulder actually moves. ❌ What You’re Missing: 1️⃣ Shoulder Extension – The ability to move your arm behind your body without dumping forward 2️⃣ Internal Rotation – The ability to rotate the arm inward, often blocked by a tight posterior c