But she will throw her way back into competition the only way she knows how - with an event where "everyone will be walking into the unknown".

Taking it easy isn't an option for Wu as the 32-year-old takes to the start line for the inaugural T3X Canberra Endurance Triathlon.

The event is Australia's only ITU long-distance triathlon with a 4km swim, a 120km bike ride and a 30km run leg, somewhere in between a Half Ironman and an Ironman.

Wu admits she doesn't know what to expect.

"It's definitely a unique distance," Wu said.

"It's not offered anywhere around Australia and it's not a common distance worldwide either.

"It's definitely challenging, but it's not a full Ironman.

"It will be an interesting race because everyone will be walking into the unknown."

Wu started of the year strongly with victory at Huskisson long-course triathlon in February before finishing sixth at Ironman Australia at Port Macquarie in May in a time of 10:24.49.

She has not raced since after sustaining a back injury while on a bike ride during training in Brisbane in July.

"It's just been a really strange one," Wu said.

"I've had cortisone injections and all sort of scans on the planet and still haven't been able to get on top of it.

"I've been referred to a neurosurgeon, so it could be a bit more serious than I thought.

"We'll see how that goes on the weekend."

Providing her back holds up, Wu is aiming for next year's Ironman Australia while the renowned Hawaii Ironman is something she aspires to do.

"That's definitely the big goal," Wu said.

"It's really hard to qualify now, they've changed all the rules and procedures.

"Getting to Hawaii is no easy feat, especially for the professional ranks.

"It's a long-term goal of mine that I would love to do, but I have to be realistic about it in terms of expenses and what my body can handle."

The T3X Endurance Triathlon starts at 7am, with competitors in the 77km T3X Canberra Triathlon taking off at 7.30am.

The course takes in some of Canberra's most famous landmarks, including Parliament House, Lake Burley Griffin and Black Mountain.

Meanwhile, Claire Ashworth did the double in winning the half-marathon and the 10km event on Saturday.

Xavier Flynn won the marathon in a time of 2 hours and 45 minutes to qualify for the New York Marathon, while Rachel Glasson won the women's marathon.

Nicholas Kastelein took out the men's half-marathon, while ACT Minister for Sport and Recreation Shane Rattenbury won the men's 10km event.