At the age of just 16, Mary Corbyn has earned the ring-name 'Scary Mary' after winning the World Kickboxing Championships four times.
This autumn the teenager will travel from Redcar to Russia to defend her world title where she hopes once again to bring back gold.
Outside the ring she's described as quiet and shy, but inside she's anything but the shrinking violet:
Mary's many titles include Double British Open Champion, European Champion and four times World Gold Medalist.
Her family say they have seen kickboxing transform their shy girl:
'Scary Mary' has already won big in a number of competitions. Credit: ITV News
Mary's proud mum Leasa is backing her all of the way:
Mary is now preparing to defend her world title in this year's championships in September. Her coach Catilin Chapman is also a former champion, so she's got more than a fighting chance:
Mary's plan to bring back gold in September is to work hard and stay focused: