However, even the most determined soul can be disheartened when pushed enough.

The news of the latest coronavirus outbreak forced the Ironman Australia competition in Port Macquarie to be postponed yet again.

She initially signed up in May 2020; it's been over 12 months of waiting, just to get knocked back at the last minute.

The May 2020 Ironman race was postponed to September before being delayed again to May 2021; it has now been pushed back to September 2021.

"When you pour everything into the training, it's a bit heartbreaking," Ms Miller said.

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But the 41-year-old mother of three took it in her stride.

"I did the Geelong half Ironman, which was meant to go ahead in February," Ms Miller said.

"I was all ready to go and then we went into the five-day lockdown."

Thankfully, that went ahead in March.

Ms Miller said she wasn't sure what to do once she realised when the Ironman was moved to September.

"I asked myself do I hang off and wait until September, or do I use the training I already have under my belt and continue to build for an Ironman?" she said.

"Which is what I did, I was able to transfer my entry to Cairns which is meant to go on Sunday, June 6."

She said her fingers were crossed it would still go ahead.

"A few people have said I should do the triathlon around Horsham," Ms Miller said.

"I'll just take it as it comes."

While she was an active child, Ms Miller didn't start running until her second child. She began with the Mother's Day Classic, which went onto half marathons, full marathons, Horsham triathlon, transitioned to half Ironman and then full Ironman.

"It just kept going," she said.

Training for Ironman was months in the making, but Ms Miller knew she wanted to do the full Ironman.

"I've trained all through COVID-19," she said.

"It has been specific training since before February. I've been building since the start of the year, but the last 8-12 weeks have been full on training."

She said her family was upset for her when the lockdown was announced.

"They've been really supportive the whole journey," Ms Miller said.

"A lot of my teammates have all gone and are in Port Macquarie. But I have three children, work and family that I just can drop and pack up and go. That's the decision I made."

Having competed in the Hawaii and France Ironman races in 2019, Ms Miller's goal is to get into the Ironman world championships.

"The more than I have done, I just want to see how far I can get in the sport. To see what my potential might be," she said.

"The pinnacle is to qualify for Kona in Hawaii."

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When Ms Miller raced in Hawaii in 2019, she came sixth in her age group.

"The atmosphere is amazing," she said.

"It's drawn a bit more fire in my belly to see how far I can go in the sport."

Ms Miller said the Ironman race taught her if you set a goal, you can achieve it.

"It might not come instantly, it takes a lot of hard work," she said.

"Consistency is the most important thing."

She said the training and race taught her day to day lessons like commitment and dedication.

The lockdown had also given Ms Miller some life lessons.

"We're pretty resilient, we can bounce back from anything," she said.

"Number one is to be grateful, grateful we live in Australia. As heartbreaking as the lockdown is, I just try to stay positive."

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