the way to maintain motivation and achieve peak levels of desire is to work on tasks of “just manageable difficulty.”3 The human brain loves a challenge, but only if it is within an optimal zone of difficulty. If you love tennis and try to play a serious match against a four-year-old, you will quickly become bored. It’s too easy. You’ll win every point. In contrast, if you play a professional tennis player like Roger Federer or Serena Williams, you will quickly lose motivation because the match is too difficult. Now consider playing tennis against someone who is your equal. As the game
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