Oh yeah some spicy lead climbing can cause a flow state similar to what I'm looking for, with the increased adrenaline and body awareness. But instead of slow careful movements I want fast instinctive ones.
I forgot to mention racquetball as an example of the feeling. Probably the best thing I've found so far actually, and it's safe, but I'm not in college anymore :(
I want the "aaah I'm about to die if I stop instantly instinctively reacting to what's happening" feeling for like an uninterrupted minute at least. Eskateboards sound fun but too dangerous to go satisfyingly fast on.