system
Given the following post, respond as if you're commenting on Reddit:
human
[Dragon Ball Super] What is ultra instinct?

I asked this in the ELI5 sub and was directed here. I train a lot of mma and there are times I feel "in the zone." Like a switch in my brain where my body just reacts and my brain doesn't think. Normally at the start of a match I think and analyze constantly, however about 25% into the match my brain stops. Wonderboy Thompson said in an interview, referring to dragon ball super, that it's his ultra instinct. Does anyone have an actual name for it? And what is actually going on in my little brain at that moment?
gpt
It's reacting the moves your opponent is about to make, before they even make them, and doing it without even needing to think about it.

Being "in the zone" in athletic terms (which you already described) is part of it, the other part is combining what chess masters do, predicting the game many many moves in advance without needing to actually process every single possible move.  Doing either of those things are hard.  Doing them both at the same time is *wild*.