"Spine mobility" refers to the ability of your back to move and bend comfortably and easily, allowing you to perform various activities without any restrictions or pain. Full definition
In dancers, it is particularly pertinent that they maintain good thoracic spine mobility due to the degree of flexibility of the spine that is required. (weckmethod.com)
Sculpting your upper and lower abs might be the key to your six - pack dreams, but if you want better spine mobility and and torso rotation, look to your obliques. (dailyburn.com)
Thoracic Spine Mobility Exercise (upper - back)-- This movement improves the extension and rotation capabilities of the upper half of the spine. (sportstarsmag.com)