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These meaningless exercises are useless precisely because they are useless.

To improve your effective intellegance, learn to play an instrument, take up a form of structured dance (ballroom, Contradance, square dancing, various ethnic dance forms) a martial art (I'm partial to Ki Aikido) even learn a new language (programming or human) or environment (I'm currently exploring the 1&1 Linux ecosystem. . .)

Whatever you learn make it something which is not left behind after the lesson.