Ennis stronger for 2012 - Backley

Triple Olympic javelin medallist Steve Backley, who was commentating for BBC Radio 5 live, expects Jessica Ennis to come back stronger having failed to defend her world heptathlon crown.

Ennis recorded two personal bests and equalled another during the seven-discipline event but a below-par javelin, in which she threw 39.95m to rival Tatiana Chernova's 52.95, proved her undoing.

Ennis put in a throw of 44m during her warm-up but struggled when she tried to throw further in competition and Backley feels she may revise her strategy in future.

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