Rawlinson won her second world title in Japan in 2007
Australia's double world 400m hurdles champion Jana Rawlinson has had her breast implants removed to improve her chances of winning 2012 Olympic gold.
The 27-year-old, who is set to remarry former British hurdler Chris Rawlinson, says the £7,000 surgically enhanced breasts had affected her running.
She said: "Every time I raced I panicked about whether I was letting my country down, all for my own vanity.
"I loved having bigger boobs but I'm back to being as flat as a pancake."
Rawlinson won world 400m hurdles gold in Paris in 2003 and Osaka in 2007 to add to her Commonwealth titles in 2002 and 2006.
She is desperate to add an Olympic title to her collection in London in 2012 after missing the last two Games through injury.
"I want to feel the most athletic I can, to know that I'm standing on the track in London the fittest I can be," she added.
"I don't want to short-change Australia either."
Rawlinson, who had the implants done and reverted to her maiden name Pittman after splitting from Rawlinson in April last year, said she would consider having her breasts augmented again once her athletic career was over.
She is also preparing to remarry Chris after the couple, who married in 2006 and have a son, were divorced in May.
Chris, who won 400m hurdles Commonwealth gold in 2002 despite suffering food poisoning after eating chicken that had been left in his car all day, coached Jana from 2004-09 and has now resumed that role.
"I knew instantly I was about to lose my husband forever, and I'd already worked out I didn't want that," Jana added.
"I was miserable without him, and our heartache hit me harder than losing at the Olympics or anything sport-related.
"It's just the best feeling to be back to us."
Before they can remarry, the couple first need to finalise their divorce to annul their first marriage.