Green tells me he grew up on a farm near Pirinoa, catching the bus for school in bare feet every morning with his older sister.
Moving to Wellington and going to Northland School meant getting used to shoes, but it also meant establishing some lifelong mates, including one which Green organised an elaborate party for over the weekend.
He describes how they managed to keep him blindfolded, with headphones, from Auckland to Wairarapa, for a surprise birthday party with friends.
He's clearly a man who likes the planning, and it's too good an opportunity to resist. I ask: how much of the planning of dates on The Bachelor is down to him?
"Most of the things were my idea," he says.
"I have never really done dates, as such. I just have adventures."
He describes how he once planned a surprise weekend for a former girlfriend, where he set up a tent in advance at a campsite.
"I packed a bag for her, picked her up at work and said we'd go for a drive. We ended up at this campsite, and she said, that looks like our tent."
Green says he suggested they go inside, which she said in horror, you can't go into someone's tent. He owned up, and the weekend was on.
Adventures and opportunities inspire Green, but he hadn't sought out the show. The chance to go on The Bachelor was "completely random. The way it happened, my flatmate, she randomly got this email.
"It was a day we were interviewing for this flat, and she had been emailed by someone from the production company asking, do you know anyone that fits this criteria?"
His flatmates said they'd put Green forward. "I said, yeah, cool. Do it."
Green was contacted, went through three separate interviews and a five-hour psych assessment "to figure out if I'm crazy or not".
He also had to do lots of jogging along a beach, and talking to camera about his feelings "which doesn't come naturally to me - to most Kiwi guys".
Afterwards, he put the whole thing out of his mind.
He says he "ummmed and ahhed" when he was offered the role of The Bachelor, asking himself if it was the right thing to do.
"How many people get the opportunity to do this? You never know what could come out of things.
"You know what? By the time I started to question the decision to do it, it was too late. I was driving to the mansion to meet 21 girls."
He said they filmed every day for two months, mostly in Auckland, then in Bay of Plenty, and finally in "another location" he's not allowed to reveal.
"We were so lucky with the weather - one day of rain the whole two months."
I ask him if he has any advice for dating, and he pauses for a while. "Just finding something that I know they [the date] are going to like, learning it really well, just so it's going to be something fun and enjoyable."
Food is key, he adds.
"Everyone loves good food."
"If diamonds impress them, it's not the girl for me."
Food is certainly key to Green, who founded health food company CleanPaleo with two of his mates.
He met them as action extras on the set of Spartacus, where they all had background sword fighting roles.
That and The Bachelor have been his only TV roles.
His lean fitness and muscles are a legacy of his sports science degree from Otago University, sword-waving, plus diet and fitness training, five times a week, which includes throwing tractor tyres around. Like cross fit, but without the weights, he says.
His father Mark liked weights, so Arthur worked out with him from age 15, with makeshift weights made from car axles and drench containers on either side, filled with water.
"I've always looked up to Dad. He's the fittest, strongest guy I know."
Martinborough is home base, where family are, and a place to "chill out" with a spot of fishing, paua diving or duck shooting.
His family appear happily comfortable with his fame, even if his sisters think it's "weird" him kissing all those girls.
"I love the fact that all my parents get on. It's one of the best things that have come out of this."
He says he has "thoroughly enjoyed" the experience.
"It's changed my life, right now, but it hasn't changed me."
His older sister Emily has been good with advice, he says.
"When I was freaking out, she said: just relax. You might find someone you like."
His main worry was he wouldn't like anyone.
"That's the worst case scenario. Best case would be find my love."
He said he found it hard to talk about it at first.
"Then I thought, you know what? Everyone wants to find love."
