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Enjoyment appears at the boundary between boredom and anxiety, when the challenges are just balanced with the person’s capacity to act.
Mihaly Csikszentmihalyi • Flow: The Psychology of Happiness
Finding flow has largely to do with performing tasks that match your skill level. When a task is far beyond your skill level, you will feel defeated. When a task is too easy, you'll be bored. Only when a task is challenging but achievable will you feel good about doing it.