A two-time champion’s comeback, an astronaut and extraordinary journeys through illness and injury – meet five athletes bringing compelling age-group stories to the 2026 IRONMAN World Championship.

Twenty years after his second IRONMAN World Championship victory, Normann Stadler is returning to race in Kona.

The German was once the man everyone feared on the bike in Hawaii. Now, following the heart surgery that ended his professional career in 2011, he is preparing to tackle the course again as an age-group athlete.

His comeback is one of the most striking stories at a championship where the professional title battles are only part of the picture.

While the biggest names chase victory at the front, thousands of other athletes will pursue their own world championship ambitions across the same 3.8km swim, 180km bike and marathon.

Here are five stories worth following on Saturday 10 October.

Normann Stadler: A champion returns, 20 years on

Few athletes on this year’s start line have a connection with Kona quite like Stadler’s.

The man known as “The Norminator” won the world title in 2004 and again in 2006, building his success around formidable cycling strength.

His 4:18:23 bike split in that second victory stood as the Kona course record for 11 years, until pro cyclist Cameron Wurf lowered it to 4:12:54 in 2017.

But in 2011, the priorities changed dramatically. At 38, Stadler underwent open-heart surgery, bringing his professional triathlon career to an abrupt end.

Fifteen years later, he is returning to the setting of his greatest sporting achievements with a very different perspective.

Stadler, now 53, will race as an age-grouper rather than a professional contender.

The familiar roads will carry plenty of memories. But this appearance represents a new chapter: taking on the complete Kona challenge again after everything that has happened since his racing days at the front.

Two decades after his last victory, reaching the finish on Aliʻi Drive would be a significant moment in one of triathlon’s most recognisable careers.

Linda Ashmore: Still setting challenges at 79

Britain’s Linda Ashmore is the oldest woman in this year’s field at 79, but her story extends well beyond that distinction.

The former teacher took up triathlon later in life following a breast cancer diagnosis and quickly rose to become an age-group world champion, capturing the 70-74 age-group world title in Kona in 2017 when she finished more than 45 minutes ahead of her nearest competitor.

Already recognised as the oldest British woman to complete an IRONMAN, Ashmore qualified once again for the IRONMAN World Championship in Kona in 2026 at the age of 79 and is set to compete in the 80-85 category – a division in which only a handful of women have ever raced.

An accomplished open-water swimmer, she also holds the distinction of being the oldest woman to swim the English Channel, completing the crossing at age 71 while raising funds for Cancer Research UK.

She is a grandmother to eight and another World Championship appearance continues a career that gathered momentum at an age when many people assume their biggest sporting challenges are behind them.

Michael Oakes: From broken back to Kona start line

For British athlete Michael Oakes, simply reaching this championship represents a remarkable recovery.

Three years ago, a skydiving accident left him with a broken back. Contemporary reporting described how a mid-air manoeuvre went catastrophically wrong, with emergency teams coming to his aid.

Told he might never walk again, he committed himself fully to recovery.

Now the 50-year-old is preparing to take on one of endurance sport’s most demanding races.

The contrast is striking: from a serious injury to a World Championship requiring an ocean swim, a 180km ride and a marathon.

His story adds another dimension to the achievement of making the Kona start line. The race itself is an enormous undertaking, but for Oakes it follows a journey back from an accident that changed his life.

Luca Parmitano: An astronaut takes on Hawaii

There will be few competitors with a working environment quite like Luca Parmitano’s.

The Italian is a European Space Agency astronaut whose career has included two long-duration missions aboard the International Space Station, spending a combined 366 days in space.

This weekend, his challenge will be firmly earthbound.

Parmitano joins the athletes taking on Kona’s ocean swim, exposed bike course and demanding marathon – a very different assignment from the missions for which he is best known.

His presence brings an unusual background to the championship field. But once racing starts, the same practical demands apply: pacing, fuelling and managing the conditions through a long day in Hawaii.

Amy Dodson: An endurance career after cancer

Amy Dodson’s sporting journey has been shaped by challenges that began long before she reached a triathlon start line.

The American lost her left lower leg to cancer at 19 and had a lung removed following another cancer diagnosis at 21.

She subsequently built an endurance career that has included more than 30 triathlons and becoming the first female leg amputee to finish the Boston Marathon.

Now, at 64, she is preparing to take on Kona.

Her story brings a powerful perspective to a championship often discussed in terms of marginal gains and finishing times. Behind every athlete is a different path to Hawaii, and Dodson’s has included decades of adapting, training and pursuing new goals.

On Saturday, that journey will take her across the same course as the sport’s biggest stars, towards the same finish line on Aliʻi Drive.