Most of us like a random shoulder massage. It seems like we have a constant tension in this region. Specifically when we are stressed.
So why the shoulders? Why not the legs, arms or stomach? And where does tension come from, anyway?
In: Biology
In short a combination of, [Bipedalism] (https://www.youtube.com/watch?v=aPFW1beLqR0), and [bad posture] (https://www.youtube.com/watch?v=Sorp0TUChIY)… holding your upper back muscles in odd positions restricts blood flow and causes knots and tensions to form. Messages increase blood flow, among other things like lymph and serotonin, which release tension. Arm and leg muscles tend to move and stretch more, and have better blood flow… although at the cost of increase joint load. The stomach is part of your vital organs which require a massive amount of blood flow, etc to function, so it is less likely to develop the same symptoms.
~~> I should note, I am not a medical professional, this is just my best understanding of the symptoms you described.
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