After a first-round bye, the Reds open their season against Moana Pasifika at Suncorp Stadium on Friday night.
Flook had a break-out season in 2024, becoming a regular Queensland starter and earning four Wallabies caps.
Looking to add to that tally, the 23-year-old recognised he needed to add to his 88kg frame to hold his own against some of the bigger centres in the game.
"I've definitely bulked up, been able to put on two or three kilos during the off-season," said Flook, now weighing in at 91kg.
"It's definitely something that I needed ... being able to maintain and sustain that weight has been really good for me as it's a part that I've struggled with in the past.
"I had a bit of a niggle towards the end of last year and with that improving, I've been able to get back into the gym pretty hard so I've been able to build my strength back up to what it should be as a super rugby player but definitely the eating is a big part for me.
"Unfortunately when I start running it strips off me so I'm having six meals a day or so, making sure I have one before dinner every night to try and help me."
Flook said he wanted to make the Queensland No.13 jersey his own and hoped a solid season there would lead to a call-up to face the touring Lions.
"I've had a couple of good years on top of each other now so I think this is a year where I can really put my foot down and take claim on this 13 jersey here at the Queensland Reds and really make it my own and really make an impact on the team and the competition," he said.
"It's an exciting year with the Lions coming across ... but you've got to be successful at club level first to put your hat in the ring for those further honours so my main focus is to keep improving each round."
The Reds finished fifth on the ladder in 2024 but made a first week exit in the finals however Flook said they had grown heading into a second season under coach Les Kiss.
"We're expanding on our game and another season with Les and the coaching group's really helped us as well.
"He's implemented some new things, growing from our basics last year there's going to be some exciting footy."
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