Assistant coach Mike Cron revealed last week that he has recently been studying the art of ballet to learn more about lifting techniques and has also spent time with cage fighters to quiz them on their grappling techniques.
But being able to gain access to the inner sanctum of an institution such as the US Marine Corps has taken the All Blacks into new territory.
"I'm a firm believer in getting outside the square all the time," says Hansen. "We can learn from within and we can learn externally. We have got our heads around the internal bit and that is learning from the Super Rugby franchises, provincial unions, each other, other national unions and other people in our game.
"Externally there is a whole lot of other areas we can explore if we are brave enough to do it and flexible enough in our thinking.
"I am fortunate to head a group of people who are great exponents of wanting to get better and we drive that message to the players and we live it ourselves and we have programmes that we set up for ourselves so that people are going all over the place and coming back to share that information.
"Everybody is probably doing that but if you stop looking to learn then you may as well retire."