The one to beat: Jessica Ennis has seen her opponents move closer Jessica Ennis admits that the battle for Olympic gold in London next year will be won as much in her head as on the track. That is why the 24-year-old world and European heptathlon champion is turning to sports psychology to gain an edge over rivals who believe they are closing in on her. Ennis, who studied psychology at Sheffield Hallam University, is delighted that she was able to follow up her world outdoor title in 2009 with a world indoor and European crown last year. But she is also increasingly wary of the challenges ahead, which include the European Indoors in March, a defence of her world outdoor title in the