Double Olympic champion Alistair Brownlee has vowed to defend his title at this summer's games in Tokyo.
The 31-year-old, who has lived in Leeds all his life, took the gold medal at the 2012 London Olympics and the 2016 Rio de Janeiro Olympics, but has focused almost exclusively on Ironman races in recent years.
The Ironman is a gruelling discipline which consists of a 2.4-mile swim, a 112-mile bike ride and a full 26.22-mile marathon.
Brownlee has won two silver medals on the Ironman circuit so far - but he has announced in an interview with BBC Sport that he will return to the sport that he dominated for several years to try and claim a third Olympic gold medal.
"A year ago I wouldn't be doing this, because I knew I couldn't cope with another bad injury," he said. "I just wanted to be able to run and compete and enjoy it.
"But in the past year, I haven't been injured. I've really enjoyed training and I've really enjoyed competing, and preparing to compete.
"And so the decision crept up on me a bit: I want to go to another Olympics, and I want to see what I might be able to do.
"In a really strange way, I'm in a better position now than I was before the last three Olympics. In 2008 I didn't think I'd be going. In 2012 at this stage, I'd torn my Achilles. And in 2016 I'd had an operation on my ankle; there were issues with my hamstring. This time I've got nothing wrong with me at all."
He will likely line up alongside his younger brother Jonny in Tokyo, four years after he narrowly beat him in Rio.
So is there any chance that he would let his brother win if they're neck-and-neck on the final stretch?
"No! I'd still be absolutely ruthless," he told BBC Sport.
"I think Jonny is happy that I'll be racing, although he'd probably never say it.
"He's aware that I was committed to helping him, so I'd be doing that sort of training to help him get there. So that's not changed that much."
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