Brumbies' Frost hungry to beef up ahead of World Cup

Brumbies man mountain Nick Frost says he's still on the extra meals as he looks to reach new heights that might help both club and country.

Standing 206cm tall and weighing in at 119kg, the Wallabies lock says he's looking to avoid losing any weight he added in the off-season and put on even more now ahead of this year's World Cup.

He's part of an imposing Brumbies pack that will need to step things up this weekend if they're to challenge the Blues in their Super Rugby Pacific encounter, and try and exact a degree of revenge after they denied them a place in last year's final.

But for 23-year-old Frost, who was recently named Rugby Australia's Rookie of the Year, beefing up and growing into his lanky frame remains high on the agenda.

"I've always been tall and skinny, pretty much ever since I've been in a proper rugby program it's always been about putting on weight and bulking up, having extra food and little meals here and there," he said.

"It's second nature at the moment … just to try and add a bit more weight each year to get stronger, you can always be stronger, fitter, faster.

"These are the little pieces to your game you're trying to put on."

Frost knocked back a huge deal from Japanese rugby to commit to the Brumbies last year and he's already been rewarded with some national team caps, showing his strength in the Wallabies' recent Spring Tour.

But it's back to club level for now, where his Brumby teammates will need to dig in against a Blues side that put 60 points on the Highlanders last round.

"It's good to jump straight into some top-tier competition … we obviously had the Tahs on Friday night and then we've got a big game against the Blues," Frost said.

"Over the past two rounds (against the Blues) we've had one or two-point losses, a close one in the semi and even in the round 14 match we played.

"There's a lot of mutual respect there between the teams ... but we're really keen to throw the kitchen sink at them and play without fear."