'He got his back up': How a sledge from Cameron Munster's wife spurred him to 6kg weight loss

A sledge from Cameron Munster's wife reportedly spurred the Melbourne star into shedding six kilograms during the NRL off-season.

The veteran five-eighth was at his scintillating best on Sunday as his Storm downed Parramatta 56-18 in sweltering conditions at AAMI Park.

It was after the game that Munster revealed his impressive weight transformation.

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"It's awesome, 33 degree heat in Melbourne, can't get any better," Munster told Nine's Ruan Sims.

"It helps when you lose six kilos... obviously had a really good pre-season, that's not always going to happen."

Munster battled a serious groin issue last year and was limited to 17 games for the season as the Storm fell one win short of a premiership.

His coach Craig Bellamy had a heart-to-heart with the Origin superstar where it was suggested Munster could lose some weight.

But it was reportedly a quip from his wife Bianca which pushed the playmaker over the edge.

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"We had a bit of a chat about a couple of things but I certainly didn't say to him 'you need to lose some weight'," Bellamy told media following Sunday's win.

"His partner Bianca might have thrown something there (too)... I'm not quite sure if this is right but I think Bianca might have said… 'you'll never do that', so he got his back up and he did.

"I think it's really helped him. He's a lot fitter and able to get involved and the more he's involved the better we're going to be.

"He's been fully invested in the pre-season, he's just a bit lighter. I don't think he's lost any strength and certainly not any speed, he hasn't got a lot of that to lose anyway.

"He just took the game on a whole heap today and I just think that's when he's playing his best footy and losing a couple of kilos has really helped him do that."

Melbourne has a round two bye before taking on Penrith in a grand final rematch the following week.