"Every year I think our group takes another step forward,'' said Gill, who has trained the team since 2008. "Every year it grows another few centimetres in everything we do. I don't just mean physically, I mean mentally, I mean technically and tactically across all our areas of performance.
"The franchises do a great job in delivering great players and our environment brings another step out of them.
"It's hard to quantify, but this group works bloody hard and it's got probably the best performance culture I've been in.''
The evidence is there for all to see. At the end of a long and hard (and successful) season, the All Blacks tend to finish a test stronger than their opponents, no matter who they are.
It was obvious at Twickenham against England last weekend, just as it was against South Africa in Johannesburg at the end of the Rugby Championship.
The All Blacks' victory over France at Paris a fortnight ago was a bit more frantic in the final minutes but the forward pack had enough strength and presence of mind to be able to repel the final France scrum for a seven-point win.
The main obstruction to the All Blacks' conditioning is the constant travel, but Gill said in some ways it was a good thing too.
"Travel is really hard so the balance between working hard, recovery, travel and performance is a pretty fine line. We work pretty hard, and I'm pretty sure most teams and staff say the same thing - it's all about the individual; what's good for the individual... where has he come from and where are you trying to take him? That's what we pride ourselves on.
"We learned a lot last year in the new Rugby Championship... this year we've probably had a healthier group.
"The difference is we're together 24-7. We don't have a base and for me that's a bit of a strength. You're sitting down to dinner with players every night, you're having breakfast with them every morning... it's more involved than being in a team where the players clock out at 4 o'clock every day.''
Those traditionalists out there will be relieved to know that this week - the final of 14 tests this year - the All Blacks still did some fitness work which included running. Rowing was involved too. As Gill said, some things just have to be done.
"I used to think I had to keep things fresh all the time but ... it's not about doing things to make you happy. Fun is important but freshness comes about through achievement.
"To see the boys finish over the top in London was really satisfying. It was rewarding for all involved. We had a pretty good bench contribution as well. It's always great to see the boys physically dominate a team. It is satisfying from a coaching and medical point of view that we can still do that at the end of our season.''