A pair of siblings from Western Australia's north are preparing for the biggest competition of their lives, representing Australia at the BMX World Championships.

Thirteen-year-old Nate Robinson and his nine-year-old sister Lacey have been riding since they were three years old and have spent countless hours training on red dirt tracks in their home town of Karratha. 

Mum Nicole says she did not have a say in her son's decision to pick up the extreme sport.

"He's pretty set in the BMX life," she says.

"He definitely wants to do it, until the age of 70 apparently."

There are risks and dangers like any sport, but nerves are often heightened during competition time.

"They put a lot of work in and a lot of hours.

"I'm definitely very proud of them and their achievements and what they've done."

From states to world championships

Always one to follow her older brother, Lacey also picked up riding when she was three.

Despite the injuries and falls, she says she keeps riding because it is fun.

"I fell in the first corner [of the track] and I have a scar on my chin now."

To prepare for the BMX World Championships in Glasgow in August, Nate and Lacey have been training hard.

Their regimen involves riding three times a week, with sprints, squats, box jumps and the occasional ice bath.

"I'm excited and I can't wait to go," Nate says.

"I'm pretty nervous. Normally, I just get out there and then do it.

Nate and Lacey's bond is "as close as you can get," according to their parents.

Like many young athletes, the idea of future Olympic contention is at the forefront of their dreams.

Lacey says she would like to bring back a "bronze, silver or gold" medal.

The duo want to continue riding into their future, with Nate telling his parents he wants to spend his life travelling across Australia and completing as many tracks as possible.

"Taking my career wherever it goes," he says.

"I just like riding."