Sonny Bill Williams is battling it out to get up to speed with the New Zealand Sevens programme ahead of his debut in Wellington.
Williams admitted that the fitness requirements were more intense than anything he'd been through beforehand.
He has also been leaning on injured captain Scott Curry for advice as he continues to adapt to the sport ahead of the Olympics in Rio.
Williams is also relishing the demanding environment that comes with working under Sir Gordon Tietjens, with New Zealand looking to get back on track after a slow start to the 2015/2016 Sevens World Series.
"I thought the pre-season of rugby league was tough but here it is a whole new ball game. It is tough days but it is just a repetition every day. I'm lucky enough that they are easing me into it this week but it is still very tough," Williams told the All Blacks' website.
"I know I've got a lot to learn, I know where I am at but I've got faith in my ability and what I can bring to the table.
"It was a bit of a wake-up call, but in saying that I know where I am at, I know where I want to go and I know that comes from a lot of hard work.
"The best thing about what he [Scott Curry] has said and Titch has said is that you have got to be aggressive and play what you see.
"You don't want to be stuck in that frame of mind where you are a wing or a prop or a centre, you've got to cover every position because it is not like 15s where you can have a bit of time to move around."