I understand and agree about the skepticism. All I can say from a personal experience with it is that I can immediately tell who on here is describing it right, and who isn't. Maybe it is just suggestion, maybe it is related to the ASMR feeling, and similar to yoga, but I have never heard of those producing such intense sensations that can make you dizzy, give yourself a headache, make your heart race, increasing to make a limb or finger ache, or filling up the whole body until it "burns" and I feel like I want to burst. I've never heard of those kind of sensations being controlled and turned off and on like a music beat or quickly "thrown" back and forth through the body, and the intensity held for hours, all without flexing a single muscle. Either we are weirdly naturally really good at meditation while walking around, having conversations, doing daily activities, etc. from a young age without needing to focus or ever learning how, or something else is going on here.
I'm all for it being scientific and avoiding mysticism. I love a good scientific discussion. Astrophysics and theoretical physics are some of my favorites topics. Maybe it is just something we can do with our nervous system, but none of the ASMR/yoga type suggestions have satisfied me compared to what it feels like to myself and those that I can confirm are describing it the same specific way. I need more study and evidence before I just brush it off as such, but not sure where or how to get that.