In 2016, Brody was diagnosed with Ewing Sarcoma, requiring surgery to remove bone from his leg to place in his arm, as well as chemotherapy, a lumbar puncture and blood transfusions.

Now Brody is in remission, being cancer-free since October 2018, and plans to raise funds for the Great Cycle Challenge for the third consecutive year, which raises money for the Children's Medical Research Institute.

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He's already smashed his target of one kilometre already, having ridden 2.5 kilometres so far this month.

It's a fantastic effort considering that he can find physical activity challenging and that his arm can struggle to grip the handle bars for too long at one time.

"I've been riding down near some paths at Eglinton with my dad," he said.

"I want to help kids get better because I had the same thing they had."

Brody's mum Stacey said her son's attitude in recovery has been terrific.

"He's been really sick with influenza A this winter. It seems like he picked up everything this year, but generally he's been good, just like a normal six-year-old," she said.

"He's reading, he's writing and doing everything he should be at school. He plays soccer in winter and he'll be starting cricket soon.

"He doesn't really remember or understand all he's been through. He still talks about hospital because he loved it.

"We talked about doing the challenge and he asked us where the money goes. I explained what research is and he asked, 'Was that the guys in the white coats who do the important stuff?' and I told him yes.''

The fundraiser encourages cyclists across Australia to challenge themselves and set their own personal riding goal throughout October to fight kids' cancer.

To register or make a donation to the challenge, head to the website at www.greatcyclechallenge.com.au.