A key unlock for me was doing exercise where at some point I was trying so hard and breathing so aggressively that I couldn't really think anymore, I could only focus on the task at hand. For me, that's been biking up steep hills. I like biking because I get to see a bunch of cool stuff and if I go up hills I get a dope view. I joke that doing these rides feels like I'm re-boring my arteries because my heart pumps so…
When I was trying to integrate a definition of “flow” that covered my many experiences, it wasn’t biking up hills per se, it was those moments where bad shit almost happened and I saw a way through and just did it. Riding through gravel, loose dogs, when the “fast guy” tried to drop the pack and found me on his wheel. I think I agree with you that these experiences are pivotal, because they are moments when you just…
Heck, a week ago I did a 100 mile MTB race, with the goal of finishing and being happy. While bits and pieces are there, some chatting with folks and things I saw along the trail, but I honestly do not remember most of the ~9 hours I was riding. It was just a thing I was doing, disconnected from most of the rest of the world, and content doing it.
(Note, I'm talking about XC/cross-country mountain biking, and to some extent trail biking. NOT the big downhill/jump/whatever stuff that comes up most often in media when sees mountain biking. It's still quite exciting, but far safer because it's really just riding bikes on hiking-ish trails.)