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Relaxed Campbell sisters dance into 100m final. WATCH THEIR MOVES

Cate and Bronte Campbell were in a playful mood before both qualifying for the final of the women's 100m freestyle final.

Cate qualified fastest, breaking the Olympic record she earlier broke in the heats.

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Bronte was fifth-quickest, giving the Aussies a red-hot chance of multiple medals in the final.

Channel 7 cameras caught them mucking around prior to the race, highlighting just how confident they are right now:

World record holder Cate and her world champion sister Bronte were drawn in separate semis as they prepare to write another chapter in their unusual rivalry, just days after winning 4 x 100m freestyle relay gold together.

She glided through the race and appeared to take her foot off the pedal at the end.

"It never feels as effortless as it looks. I'm one of those really frustrating swimmers that you're like: 'Cmon, you look like you’re not trying'. And on the inside I'm like: 'I'm trying really hard.

She also downplayed the new Olympic mark.

"Yeah, but you know, people have been going under 53sec. for the past three years so it's not that big of an achievement," she said.