"back extension exercise"

A Catch in Your Back Every Time You Move? Thoracic Facet Joint Syndrome and the Symptoms You Might Not Notice

Have you ever gasped and frozen mid-motion while gently turning your torso or stretching at work? That sudden catch in the middle of your back, locking up so sharply that taking a deep breath feels hard, is far more common than you might think. You only want to straighten your back comfortably, but that persistent ache keeps getting in the way. Why does this happen?