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Deliberate practice, by its nature, must be hard. When you want to get good at something, how you spend your time practicing is far more important than the amount of time you spend. In fact, in every domain of expertise that's been rigorously examined, from chess to violin to basketball, studies have found that the number of years one has been doing something correlates only weakly with level of performance. ... Regular practice simply isn't enough. To improve, we must watch ourselves fail, and learn from our mistakes.