Flow is a psychological interpretation of basic samadhi
You can read the transcript of a Ted talk here or watch it in French
https://www.ted.com/talks/mihaly_csikszentmihalyi_flow_the_secret_to_happiness/transcript
This is how and why in Sufism a craft/occupation is seen as a way into Divine Consciousness. It is of course far deeper and more comprehensive than the soft sciences have found.
In Dharma, Hatha Yoga and other physical disciplines, there is a more intense effort and practice. For example using Vipassanā, mantra, walking and other meditations. The difference is that retaining such an intensifying concentration is NOT the goal but a stage to an independent awaking that does not leave but also changes.
https://www.lionsroar.com/everything-is-enlightenment/