大象传媒

A grandmother from South Cambridgeshire's become a two-time world champion in a sport you might never have heard of.

Celia Duff, who's 70, won her first Hyrox title in 2022.

The sport combines running with pushing, pulling, lifting, rowing and carrying heavy weights.

She now goes by the nickname Badass Gran, and has thousands of followers on social media.

Tom Jackson hits the gym to find out more.