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Security with dogs patrol around the Sochi 2014 Winter Olympic Park in the Costal Cluster on January 28, 2014 in Sochi, Russia.
Elite athletes are used to pressure and high stakes. But consider that pressure as the world watches, such as at the Olympics. The upcoming Winter Games in Sochi comes with yet another source of pressure: the possibility of terrorism.
For more on how this could affect athletes, we're joined by sports psychologist John Callaghan, professor at the University of Southern California.