Each October, there’s a migration of Ironman triathletes to the Hawaiian islands as some of the world’s fittest athletes descend on beachside Kona.

It’s also at this time, that those left at home watch on with envy as the footage flows in from the Big Island.

So with that in mind, here’s a selection of what you’re missing this week. So you don’t miss out entirely.

Celebrity chef Gordon Ramsay makes a return to Kona and will line up on Saturday for his second start. The overall average age of competitors in 2015 is 42.8 years old. Find out more race day facts like these among these 39 Things To Know Before The 2015 Ironman World Championship.

Slowtwitch always provide a nice preview of the professional fields. In the women’s analysis, Mirinda Carfrae features among the favourites, along with Kona newcomer Annabel Luxford.

Let’s not forget the men’s field, with defending champion Sebastian Kienle headlining the list of favourites.

And while we’re at it, here’s a gallery of the pro athletes training in and around Kona one week out from race day.