Bubbling under the skin

Yesterday while I was waiting for something to finish baking I did some arm swings and then some standing. When I was standing I felt like underneath my skin or maybe between my skin and my fascia there was some bubbling or some kind of pulsing feeling going on, maybe related to my hearbeat but it didn't seem to quite sync. This was going on in the space in between my shoulder blades. Is this the kind of stretch we are trying to accomplish with this warm up or was this maybe just a coincedental feeling. My heart rate did increase while I was doing the arm swings so maybe it was just something to do with that?


golden triangle