Flow experiences are those experiences which enliven us and make us relish them for a long time to come.
When in state of flow we are able to get the best and most creative work done by realizing our true potential.
Read this post to understand more about what a Flow Experience ideally is.
https://viewpointsunplugged.com/being-in-flow-leads-to-happiness-how/
Read about the great man whose research on flow has provided scientific insights on what goes on to making a flow experience.
I have indeed felt that this is true when we have the right amount of alertness and arousal wherein peak performance results in a state of NO MIND.
https://en.wikipedia.org/wiki/Mihaly_Csikszentmihalyi