What is flow state? How to enter flow?

I’m always chasing flow state. It’s when I feel in the zone, as if the environment disappears and what’s left is what I’m doing at the moment. Dr. Mihaly Csíkszentmihályi, Ph.D, one of the most distinguished psychologists of modern world, coined the term “flow state” in his 90s book. He defined this as the “optimal state of consciousness where we feel our best and perform our best” and “being completely involved in an activity for its own sake.”