At just 19 she was the women's two-time Motorcross World champion...

The first time anyone had held the title back-to-back.

Katherine had a glittering career in front of her. She might still be riding today... If it weren't for one fateful moment.

A training crash that left her with just a 50% chance of ever walking again.

Go to this episode on rnz.co.nz for more details