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More than 7,000 runners who recently raced in a half-marathon in London were under the influence of a powerful performance-enhancing stimulant -- pop music.
The music at London's "Run to the Beat" race was selected on the basis of the research and consultation of sport psychologist Costas Karageorghis. He has learned how to devise soundtracks that are just as powerful, if not more so, as some of the less legal substances that athletes commonly take to excel.