The Franks say they weren't taken seriously at age 18 or 19, but what the coaches didn't realise was they had been training solidly for four or five years at that point.
They each now weigh 118kg and Owen, 25, is an ever-present in the All Blacks front row.
Another insight comes in Ben's reasoning on why the brothers like to do their own thing.
"In a rugby squad you've got about 30 guys. For me, I'm trying to get myself to the next level, so I can perform for the team. When you've got a trainer looking after 30 guys, he's looking at a more general goal.
"Weights for me has never been about getting strong, it's about how it'll affect my technique for rugby, so I've always wanted to know, 'why am I doing this exercise?'
"I can understand how that could be annoying, but I just wanted to know the reason for everything. If they gave me a reason and I understood it, then I'd buy into it fully."
And then it's into the gym exercises via a brief look at their influences, including dad Ken, American trainer Ed Cosner and former Mr New Zealand bodybuilder Warren Thin.
There are plenty of photographs of the boys going through their paces. Top tip from the brothers: You have to earn the right to wear tight singlets in the gym. Brad Thorn can get away with it, they say. The brothers prefer baggy clothing.
Training Tough
Working Out With The Franks Brothers, Ben & Owen Franks
Hodder Moa
RRP $34.99