She competed in the high jump and pentathlon at the English Schools AAA Junior Girls in 1999, then won the AAA Girls title in the high jump the following year at the age of fourteen, clearing 1.70 metres. In 2001, she was runner-up at the high jump and heptathlon events in the English Schools AAA Intermediate section and won the high jump in 2002 with a jump of 1.80 metres. Ennis established herself as one of Britain's top junior athletes at the AAA U20 Championships in 2003 as she took the indoor pentathlon title and outdoor 100 m hurdles title. Ennis competed at the 2003 World Youth Championships in Sherbrooke, Quebec, Canada in July, where after leading at the end of the first day she finished in fifth position with 5,311 points. The following year Ennis competed in the 2004 World Junior Championships in Grosseto, Italy, where she finished eighth with 5,542 points, again after leading at the end of the first day. Ennis won two silver medals, in the 100 m hurdles and the high jump, at the 2004 Commonwealth Youth Games in Bendigo, Australia, held in November and December 2004, and won the heptathlon at the July 2005 European Athletics Junior Championships in Kaunas, Lithuania, with a British junior record score of 5,891 points. Professional athletics career One of Ennis's first victories as a senior came in February 2004, when she was eighteen years old. She won the 60 m hurdles at the Northern Senior Indoor Championships in a time of 8.60 seconds. Two weeks earlier she had won three Northern Junior Indoor Championship titles: the 60 m sprint, the 60 m hurdles and the high jump. Also in February Ennis finished third in the 60 m hurdles at the AAA Indoor Championships in Sheffield in a time of 8.43 seconds. At the July 2005 AAA Championships Ennis competed in the 100 m hurdles, in which she recorded a personal best time of 13.26 seconds, and the high jump. Ennis's first senior international competition was the 2005 Universiade, held in August in İzmir, Turkey, where she won a bronze medal in the heptathlon with a new personal best of 5,910 points, behind winner Lyudmila Blonska and second-placed Simone Oberer. 2006: First senior competition medal Ennis won a bronze medal for England at the 2006 Commonwealth Games in Melbourne, Australia with a personal best score of 6,269 points, improving