I actually achieved it without any knowledge it could be achieved.
There was a techno song playing at a club, and no one was dancing.
In dancing, I spun around with my arms out, a helicopter, like a child; and I spun and spun, who cares what people think...
I let down everything; I told myself, forget EVERYTHING you think about yourself.
The music was good, but not the main aspect...
Eventually (soon) the spinning became WAY faster than I could possibly do physically, faster and faster until I was literally out there in the universe, no physicality whatsoever. The only existence I felt was as a pure spirit flying in an infinite universe. There was no "me" whatsoever, cognitive or physical, but I was still experiencing "being".
When the song was over, I was dizzy and fell, barely able to not get hurt.
The next night I went back to the club and they came and told me I had to leave.
That may not be repeatable, for someone else, but it really happened.