Australian middle distance runner Jess Hull described her foray into the 800m at the Tokyo World Championships as a "fun little side quest".

Two-time Olympic gold medallist Femke Bol merely calls it "the next challenge".

Dutch 400m hurdles superstar Bol announced in a social media video that she would make the step up to the 800m next season, adding another dimension to one of the sport's most thrilling events.

"It's time for a new chapter," Bol said in the video.

"It's going to be an extra lap. I'm moving to the 800m."

Bol is a two-time 400m hurdles world champion, defending her title in Tokyo last month.

She also won bronze at the 2021 and 2024 Olympic Games in the event.

In both finals, she finished behind American superstar Sydney McLaughlin-Levrone, who won consecutive gold med

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