But even the best-trained runners are bound to experience a range of physiological and psychological changes.

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"The experience has also been related to a range of psychological and psychosomatic disorders, " the United Nations Population Fund says.

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The successful candidate will bring at least three years of board experience, have a good working knowledge and understanding of executive compensation, be skilled in psychological jujitsu, and have enough political savvy to win a Chicago mayoral election.

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