'You can't give up, you've got to get up'

Video caption, Four-time world kickboxing champion Billy Murray shares his cancer story.

Four-time world kickboxing champion, Billy Murray, is no stranger to fighting battles in the ring.

But, for the last four years, he has been battling a different opponent - bowel cancer.

He kept his diagnosis private until now.

But a new documentary about his life called Billy Murray鈥n his Own Words has revealed the details of his illness.

Read more here.