The team was intent on trying to win a gold medal and avenge their fifth placing in the 2016 Rio Games.
"When I first made the team was soon after the blowout [in Rio] so I guess from there we were mentally preparing [for the next Olympics] as well as change our game to suit the more modern style."
Unfortunately they had to settle for the silver medal after being overpowered by great rivals Fiji 27-12 at Tokyo Stadium.
The pain of the defeat is still raw with Knewstubb describing it as "pretty tough".
"It's always hard to go up against Fiji.
Isla Fellows and Andrew Knewstubb. Photo / David Haxton
"We hadn't really played against each other much leading up to it so it was quite weird going into the final and not knowing what was going to happen.
"There was a lot of uncertainty and we probably hadn't played a full tournament for a long time because of Covid cancelling our season and stuff.
"It was an extremely physical final and I think they just wanted it more and ended up getting the win which is awesome for them and really good for their country as well.
"Hopefully I'm young enough to have another crack at it but at the same time I was gutted for everyone back home watching, like my family and stuff like that, and also some of the older boys in the team who might not get another shot at it.