KENTHURST bodybuilder Joelle Christine, 19, has won the international Natural Olympia Bodybuilding Championships in San Diego.
Last month Miss Christine competed in the professional bikini category, and won her first title as a professional bodybuilder.
For the law and business student, who started bodybuilding as a fitness motivation less than a year ago, winning a professional world title was unexpected.
"I knew I would be the youngest competitor in my division and that I would be the least experienced so when I won I was shocked," she said.
"I've had a crazy year and feel so lucky to have won so many titles in my first year of competing."
She became a professional competitor after winning the bikini novice category and the open class at the International Natural Bodybuilding Association World Championship in Greece in July.
Miss Christine was one of 36 members of the International Natural Bodybuilding Association Australian team who competed in the Natural Olympia, bringing home 32 medals.
She started serious training in preparation for the competition in September, for which she had a meal plan, a six-day routine of lifting weights and cardiovascular training three times a week.
"It was tough to keep the momentum going in my training but very worth it," she said.
Earlier in the year she compiled a "comprehensive guide" to competing in ebook format which helped fund her trip to the US.