Happiness, or “flow,” occurs when we are: • intensely focused on an activity • of our own choosing, that is • neither underchallenging (boreout) nor overchallenging (burnout), that has • a clear objective, and that receives • immediate feedback.

As Csikszentmihalyi asserts in his book Flow: The Psychology of Optimal Experience, flow is “the state in which people are so involved in an activity that nothing else seems to matter; the experience itself is so enjoyable that people will do it even at great cost, for the sheer sake of doing it.”