How to 3 Exercise Thoracic Spine Mobility
Watch a video on how to do 3 exercises correctly Thoracic Spine Mobility
Banded Thoracic Rotation 

The thoracic spine is essentially your upper/mid back which has attachment sites for each rib.
Thoracic spine mobility and shoulder mobility are so closely related because in order to get full overhead motion you need the thoracic spine to extend out of its normally flexed position
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Thoracic Extension On Foam Roll 

It’s a frequently overlooked aspect of overhead mobility. So if you have been struggling with shoulder mobility or overhead pressing, try these drills to improve your T-Spine mobility
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T-Spine Rotation Lift-Offs 

The first and last drills are for thoracic rotation, and the second one is for thoracic extension. Both aspects are incredibly important, so make sure to address both.