"It does work," he said.
"I had two boys in the pilot class who had on-going conflict. They ended up sorting it out between them during the class using things I had taught them through the programme. They talked it through and were able to resolve it by communicating, rather than using their fists, which is what they would have normally done."
Shelley said schools had been asking for such a programme for boys "for years". She had just been looking for the right man to lead it. And now she had found him.
Raised in Awanui, Rayner attended Kaingaroa Primary and Kaitaia College. He enjoyed his time at school, but admitted to having been "a bit of a bully".
"I used to do it to feel like 'the man.' I really regret doing that now," he said, but a lot of boys were being bullied these days.
"Through this programme we will be reminding the boys of their self-worth," he added.
"We set goals with the boys and give them the courage to do what they believe in and want to do."
He had begun attending church after his seeing the positive impact that had had on his older sister, and was baptised in 2011. He hadn't been especially keen on church to begin with, "but I met so many positive, cool people, and I felt comfortable here. The church is like my family."
After leaving school he took part in a Youth With A Mission (YWAM) course last year.
"I learnt heaps there about leadership. It brought out of me what I didn't know I had," he said.
He travelled to Fiji, where he helped rebuild homes and villages destroyed by Cyclone Evan, and that experience changed him greatly. He's now looking forward to another mission this year.
He was offered the Strength programme position when he returned from his YWAM mission, and knows that that's where he wants to be.
"I feel blessed with this job," he said.
"I really want to help the boys in this community. I'm more like a big brother to them than a teacher. I wish I'd had something like this when I was a boy."
Having been a bully when he was younger gave him perspective in terms of helping teach young boys to avoid the mistakes he had made. He could relate to their feelings, and the reasons why they may have begun bullying in the first place.
"The boys look up to him. He is a great male role model and a good influence," Shelley said.
"We've definitely got the right man for the job."