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Sarah Sjostrom, known as the 'Butterfly Queen', says she is aiming to become the first woman to swim under 55 seconds over 100m.

At Rio 2016 Sjostrom broke the world record in the event and became the first Swedish swimmer to win an Olympic gold medal in the process.

"Many swimmers want to beat me in the 100m fly, but that is still one of my favourite distances so I will try to become even faster," Sjostrom said. "I know in the future I can have a time under 55 seconds."

(Image: Sarah Sjostrom celebrates winning the Women's 50m Freestyle Final at the 2017 World Championships. Credit: Getty Images)