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
This is because your arms are almost free-floating. What I mean by this is that the only bone that connects your arms to the rest of your skeleton SKELETALLY are the clavicles. And the clavicles are weak as hell― being the bone most prone to fractures.
What in fact holds your arm to the rest of your body, are muscles. Multitudes of them. The most important of them is the trapezoid. The trapezius originates from the lower-back of your skull and your upper spine (neck and chest) and then inserts into the scapula (mainly) and a bit of the clavicle. The scapula is also a part of the upper extremity― the humerus (bone of the arm) comes and forms the joint with scapula. So essentially it means that the weight of the entirety of your arms are supported by the trapezius muscle.
Now your legs don’t hurt because they are supported by thick bones (femur and tibia) which have a lot of compressive and tensile strength, which muscles don’t have― hence they get fatigued. It’s the same with stomach (supported by the thickest part of the spine, the lumbar vertebrae) and the arms (supported by humerus, radius and ulna). Your arms are supported by the muscles (trapezius mostly) which get fatigued and hence hurt and feel good when massaged. Now guess which muscle forms the bulk of your shoulder?.
Trapezius.
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