Hey all, Sunday I was laying in bed and it felt like a weird earthquake, vibrating, rumbling in my upper arm. I can see and feel the tricep popping away, but the part that really bugs me is the earthquake or rumbling feeling in my arm. I look at my arm and I can feel the rumble in the upper and lower arm. Is this what one would call a "vibration"? It is the strangest feeling ever. It goes away when I'm not thinking about, but once I think about it again, it comes back.