Ennis said: "After the incredible high of the Olympics and the post Games celebrations I went back into tough winter training with an open mind on whether or not I would want to compete indoors this year. Training has been going well, but I feel that my focus really has to be attempting to win another world title in Russia this summer and not the short term indoor season." It means that Ennis will miss European Indoor Championships in Goteborg.
Head Coach of British Athletics Peter Eriksson said: "Jess is a very mature and seasoned athlete who is focused on performing at her best in major championships. We 100 per cent support her decision in this respect, and look forward to seeing her in action later this year in the build up to the World Championships in Moscow."
Ennis' first competition of 2013 is likely to be the Edinburgh Women's League on June 8 and her first heptathlon in Tallinn, Estonia at the end of June