When I am in my Flow-state I am at my best, in whatever task I am trying to accomplish. Unfortunately I don't know how to get into this state voluntarily, it happens, sometimes, when the right circumstances meet.
To me, being 'In flow' is more than being present in the moment, its about achieving a certain level of focus where there is just the right amount of challenge to keep me interested and operating at my best, but not enough to make me take a step back; where there is just the right level of skills required to make the task technical but not so much that makes me have to stop to think.
In this state, its possible that a Human Being is able to be between System 1 and System 2 thinking, not completely intuitive but not deep thinking either. See reference to the book 'Thinking, fast and slow' by Daniel Kahneman
I feel that in this state I am able to be simultaneously in deliberate and fast thinking without going too far off to the extreme of either.
I need to look more into the science of 'flow-state' and on techniques on how to potentially pro-actively trigger it.
The below video is a segment from one of my favourite shows, the Joe Rogan's Podcast. Its a fabulous description of flow state from the perspective of a great MMA coach applied to the training and athletes, even if you do not like MMA, its worth while listening.