England loosehead prop Mako Vunipola is keen to improve one percent in every area as he strives to become a world-class player.
The 25-year-old, who's built his game over the past few years to become a feared front-row forward, is set to face South Africa on Saturday.
And ahead of that November opener against the Springboks, he has revealed that with continued work he is looking to carry on his progress.
"The biggest message is not to be happy about where we are," Vunipola told BBC Sport before saying that he's being constantly pushed.
"There is more accountability and responsibility on the individual. Eddie Jones [England coach] keeps sending me texts if I need a nudge.
"We want to be the best we can be. For me it's about improving one percent in every area."
Vunipola has always been a confident player with ball in hand, which set him apart from his opposing props, but now he has also developed his scrummaging. While he knows set-piece is vital to his game, he believes that being comfortable in possession is just as crucial.
"When I was younger, coming from Tonga, I always enjoyed having the ball in my hands," he added.
"Growing up with my brother and two cousins, we played rugby against each other a lot.
"You need all fifteen players to be complete players."