Sometimes, all I have to do is think about vibes or something spiritual or "deep" and I instantly get this feeling of being rocked back and forth very quickly. I used to regularly get that feeling when I was a child in between sleep and awake, I forgot about it, and have rediscovered it in the past year. I assume those are vibes. I've never felt anything I would describe as being like a jackhammer, but on the other hand I am not very experienced. Perhaps the vibes are just a more intense version of the body loosening? Perhaps it's just different for different people.