MitchMZ

Yeah, just like any martial art, a good JJ person will move a lot even when mounted. I find even if I have someone in the gaurd I still like to "move around" their side while keeping some contact and try to apply an arm bar from there. Kinda like a half umpa. Hard to explain, excuse my vagueness. I think it is futile to just stay stationary when you have someone in the gaurd. Although, with powerful legs you can make someone almost pee themselves by applying pressure to the kidneys (almost did that once). Ultimately, movement is essential.