I realize that this is ancient cultural knowledge, and what I'm going to say is very crude and sounds utterly stupid. But I stumbled upon a similar technique wherein I close my eyes and remember my best bowling game ever. That is, a moment which lasted 15 minutes that took place 20 years ago when my body and mind did exactly what I wanted in sync with each other, and performed almost as perfectly together as they ever have. Closing my eyes and re-living it for a few seconds gives me an endorphin rush and releases seratonin that I can feel elevating my mood almost immediately. I only honed in on this one experience in a bowling alley as my escape after years of trying to replicate various high feelings with drugs. Somehow, finding it has become a natural way to re-frame my mind in almost any situation. Although I'm afraid of over-using it, because the chemical effect is pretty powerful.
To anyone searching for something like this, I'd recommend thinking of a peak moment in your life - it could be something totally unexpected, like bowling (and listen: I'm not much of a bowler!) Just a moment when everything worked perfectly and you couldn't make a mistake. And try to re-live that moment behind your eyes.
One time when I was playing Rez¹ my consciousness seemed to split. There was the me playing the game, and then there was the me observing the me playing, spectating my own gameplay. By the time I had reached that point, gameplay seemed almost automatic. The enemies seemed to practically fly into my reticle, to be shot down immediately upon appearing. I realized I was somehow blocking my conscious focus from commenting on how I'm playing and offering corrections, leaving my unconscious free to actually do the work of targeting and shooting, as well as my conscious mind free to sit back and enjoy the ride. It was an unprecedented experience of total concentration on a task.
A further mindblow occurred when I realized that this is a thematic element in the game. In the upper left corner of the screen is a "system log" that describes what you're doing and names the things you're shooting down, that can be said to represent the mind's "narrator". But you almost never look at it because you're more concerned with what's happening on the screen. Steering your attention to the log means you'll lose focus on the actual gameplay.
Rez is like that. It's almost a metacommentary on the experience of playing it, and experience in general, sometimes. Everyone should play it.
You might find the book The Body Has a Mind of Its Own : How Body Maps in Your Brain Help You Do (Almost) Everything Better by Sandra Blakeslee and Matthew Blakeslee very relevant here.
Actually not tangential but very relevant here. In the technique i mention you have to physically focus your eyes for the mind to focus its attention there.
In traditional Martial Arts it is said; "Wherever the Eyes go, the Mind follows" and the highest stage is "When the Body becomes all eyes" i.e. an all-encompassing awareness. Philip Zarrilli wrote a book with the above name on the South-Indian Martial Art of Kalarippayattu - https://archive.org/details/when-the-body-becomes-all-eyes-p... It is not a book of techniques but deals with traditional philosophies/principles/practices which can be learnt from for use with any sport.
To anyone searching for something like this, I'd recommend thinking of a peak moment in your life - it could be something totally unexpected, like bowling (and listen: I'm not much of a bowler!) Just a moment when everything worked perfectly and you couldn't make a mistake. And try to re-live that moment behind your eyes.
Sounds totally cheesy and ridiculous, I know.