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Celia Duff, also known as ‘Badass Gran’ to her Instagram followers, is a double world HYROX champion.

That’s an indoor fitness competition combining 8km of running and eight functional workout stations, including rowing, sandbag lunges and sled pull.

Celia started competing at 68 after seeing her daughter take part. Since retiring from her career as a doctor, she now dedicates her time to an impressive training regime.

She joined Nuala McGovern on ´óÏó´«Ã½ Radio 4's Woman's Hour to discuss why she wanted to get involved in the sport and the impact it has had on her.

Listen to the full interview on ´óÏó´«Ã½ Sounds – it’s the Woman’s Hour episode from 14 January.