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Made of highly durable polymer composite, and modeled in the shape of an "S" the Original Backnobber II is designed to be hooked over the shoulder or under the arm so that one of the two ends can be pressed into any of the muscles of the upper or lower back or neck. The Backnobber II's natural shape and dimensions allow the user to apply as much pain-releasing pressure for as long as required to achieve its remarkable effects.
Muscle Zone - UpperBack Muscles & Exercises
TERES MAJOR. Outermost muscle of the upperback behind the Shoulder joint. Pulls the arm downward and backward and rotates the arm outward.
Boris Ivanovich's site -> Upperback exercises
...part of your upperback try shifting the cushion along your spinal column from one part of your upperback to the other. (3-4 reps) Exercise 3...