For me, I'd have to say that it came about when I was training with my buddy Ian, and I remarked that I had noticed that he gotten better since the last time we trained together, and he said, "I just don't care anymore," meaning that he had decided not to care so much whether or not a particular movement worked or not and would allow himself to figure out how deal with a particular situation in his own time, and in his own way. This type of mentality allows for true relaxation, and for the subconsious mind to take over more during training.

-Brian Holland