College Sport Auckland chief executive Dave Currie said, "Our view is that the core of secondary school sport is that it's fun with your mates and enjoying it.
"The most important thing about sport, particularly school sport, is that you experience a whole range of sports and find something you are passionate about and you have got some sporting activity for life."
Sport probably helped develop resilience and character and other positive things, he said, but it was hard to tell, and there was a risk of over-thinking the purpose of sport.
"I look back and think where did I develop close friendships and relationships I have got, with males particularly, and it was in that sporting environment."
Bennett said Japanese coaches employed the ideology of "seishin", which emphasises holistic education and the cultivation of the mind through harsh physical practices.
It was suggested seishin was a way to encourage vigour, positive attitudes towards hard work, and overall vitality in young men playing rugby.
They suggested the rugby experience at secondary school age would fulfil the objective of "ningen keisei" - character development - that would in turn lead to socially balanced and tenacious young men, ready to contribute to society.
Conversely, Blake said, the New Zealand data revealed a strong focus on developing correct technique and skills. Many coaches tried to maintain control of their sessions, and few were willing to break away from traditional coaching approaches to allow more player empowerment.
This was significant, as many initiatives in New Zealand sport coaching and rugby emphasised athlete-centred approaches that aimed to empower players to make their own decisions about their training and learning.
New Zealand coaches spoke much less frequently of development beyond the physical or technical, which they developed for safety and strategic ability.