Kell Brook has been feasting on kangaroo meat as he bids to become the greatest British boxer of all time.
Brook will step up two weight divisions to challenge Gennady Golovkin for two of his three world middleweight titles in London on Saturday, and he believes victory would put him above the likes of Ricky Hatton, Lennox Lewis and Randy Turpin in the pantheon of Britain's best fighters.
Golovkin (35-0, 32 KOs), 34, is regarded as the best middleweight in the world and rival champions such as Saul Alvarez and Billy Joe Saunders have turned down offers to fight the knockout specialist from Kazakhstan.
In order to prepare for his first fight as a middleweight, IBF welterweight champion Brook (36-0, 25 KOs) has left no stone unturned in his attempt to pile on the pounds.
"I've been getting more protein and been eating kangaroo and chicken," Brook said.
"My nutritionist says it's good for energy, plus a lot of organic vegetables and fruits. I've not been eating junk to put the extra weight on.
"I've always been a big welterweight so it doesn't take much for me to put weight on, but I've been eating clean.
"Eating kangaroo puts a spring in my step, it's got a unique taste, it's alright, but it's springy meat and it will make a difference.
"I like my cycling now. I took my bike out to Fuerteventura and did 50 or 60 kilometres every few days. I was riding with my top off to get the sun and vitamin D as well.
"I was just pedaling away and I got into deep thoughts doing it and it works well for my endurance.
"I've introduced cycling in the last year or so to my training. All that running is not great on the joints when you get older and cycling is less resistance.
"I've got an altitude tent and everything is being done with a science behind it. We're targeting strength and conditioning but not training with heavy weights, we're just trying to move the weights back and trying to imitate the fight."
The hard work is done! Been a great camp, can't thank you enough for the support. I am ready 🇬🇧🇬🇧🇬🇧🇬🇧🇬🇧 #GGGBrook pic.twitter.com/tOicQZnInD
— Kell Brook (@SpecialKBrook) September 3, 2016
Brook, 30, will be a big underdog for the fight against the biggest overseas boxer to visit the UK for over a decade.
California-based Golovkin was last taken to points in 2008 and is ranked second in ESPN's pound for pound ratings.
The odds are stacked against Brook who believes victory on Saturday would make him one of Britain's most successful boxers, alongside the likes of Naseem Hamed, who trained at the same Sheffield gym as he does.
Brook even believes that if he can pull off the upset it would be a greater triumph than the 1951 points win by Britain's Turpin over American Sugar Ray Robinson.
"I don't think anyone in Britain has done what I'm going to do," Brook said.
"I don't think it has been done before. Randy Turpin is the only one but because I'm going up from welterweight to fight the most feared fighter on the planet it's even bigger than that. It's debatable but that's my opinion.
"Whatever Naz [Hamed] has done or any other British fighter recently, it will blow it out the water.
"I don't think my feet would ever touch the floor again, to achieve such a thing. It's something that I could tell my grandkids over and over again and not get bored of it.
"For me, it's everything. The legends of British boxing are people like Hatton, Lennox [Lewis], [Nigel] Benn, [Chris] Eubank, [Joe] Calzaghe and it would put me with all those greats and I would be top of the pile.
"I love this game because you can come from nothing and it gives everyone an opportunity.
"A win like this is absolutely huge."