Henderson, who flew out to Auckland yesterday, said at the age of 62, he has no plans to hang up his running shoes just yet.
“It is painfully addictive and I will probably continue doing Ironman until I can’t anymore,” the veteran triathlete said.
“I have no specific number of races I am aiming for but while I can, why shouldn’t I. Maybe the day I go over the time limit is when I will give it away.”
A lack of races prior to Taupo is one of the toughest factors for Henderson to overcome each year.
“Outside of Round Raro, Ironman is the only triathlon race I compete in each year which makes it difficult but just adds to the challenge on the day,”
Another part of the challenge is in the preparations before Ironman, and with the size of Rarotonga it requires a different approach to that of an athlete from Australia and New Zealand.
Henderson said he has also been forced to change his cycle training approach, largely due to deteriorating conditions of the local roads.
“I used to go for long bikes around the island, few hours at a time. Whereas now I do a session in the morning, have a break, then a session in the afternoon as I am limited to the nicer parts to cycle on the island.
“Don’t want to train all that time then suddenly go down a pothole and injure yourself or do damage to your bike.”
The aim for this Saturday is to simply finish for Henderson, but the ultimate goal is to one day compete alongside his son Thomas and his older brother Bruce.