Your upper back (thoracic spine) contains 12 vertebrae (spinal bones) and intervertebral discs that separate and cushion the vertebrae, nerves, and connective tissues like ligaments and tendons.

Video above: Women more prone to herniated discs, study finds While professional baseball players train for optimal ...

Yet, for many people, rotation is a struggle — leading to stiffness, discomfort and chronic back pain.Video above: Women more prone to herniated discs ... mid-back (thoracic spine) and rib ...