Foam Roller 101: The Upper Back
Another good way to use the foam roller to loosen muscles.
This video gives great insight on how to use the foam roller to loosen up and stretch out your upper back.
As the video states, though, only use the foam roller from the shoulder blades to the middle of your back. Using the foam roller on your lower back is not recommended.
RELATED: Foam Roller 101: The Hamstrings