'I'LL NEVER GIVE UP*

The TV host faces her toughest hour-and exceeds even her own expectations!

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Her positive spirit and can-do attitude is infectious, but even Carrie Bickmore has her doubts about how much she can take on and achieve in her life.

Last week, the mum-of-three had to draw on all the optimism and self-belief she had to make it through the biggest physical and mental challenge of her life -running the Big 5 Marathon in South Africa to raise money for her Beanies 4 Brain Cancer foundation.

Sharing her gruelling journey with her followers on Instagram, Carrie, 44, admitted that she "almost quit" at one point, but her teammates helped her through and together they raised an incredible $1.1 million and counting for cancer sufferers.

"I did it," she wrote, noting she didn't care that she came last in their group.

"It's not about how you get there, it just matters that you get there. Try it. It's life-changing."

PUSHING HER LIMITS