Tyson Fury has issued a clear warning to Anthony Joshua that he must not lose too much muscle or switch up styles for the rematch with Andy Ruiz Jr.
'AJ,' 29, has been training ahead of his rematch on 7th December in Saudi Arabia and has posted photos on social media showing off a more trimmed physique.
But Fury believes that all of the Brit superstar's hard work could be undone if he drastically alters his tactics and physique for his second bout with Ruiz.
The 'Gypsy King' told BT Sport: "I see he's lost a bit of weight, he's been taking notice of people saying he's got too much muscle on him.
"But really that can be taken out of context as well. You can't change a bull into a racehorse. It doesn't work like that.
"A racehorse can't tow a waggon or a heavy load. Doesn't work.
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"So if you take that big heavy horse, strip his muscle off and then put him in the same cart he was in trying to pull that heavy load again he's not going to manage it.
"So I think they are going to try to lose weight and try to move a lot. But you can't do that in one camp, that takes a lifetime [of] practice.
"We saw Tony Bellew try to do it against [Oleksandr] Usyk, tried copying my style but after eight rounds his legs went.
"It works, it's effective, I've been successful 29 times in a row with it. You can't learn it overnight."
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According to Fury, many boxers fail to uphold a new style as they stick with it in training and as "soon as they get clipped or get tired [in a fight], they revert straight back to what they once knew."
He added: "I've seen it many, many times.
"As soon as he holds his feet and starts to fight back, he loses in my opinion.
"But if he can get on the jab and box and move, which I've never ever seen him do, amateur or pro, for 12 rounds -- which, for a heavyweight, is a very hard thing to do -- at some point he's going to have to stand and fight.
"And if he keeps running away from Ruiz with the jab, he's not got the footwork to do that.
"Work on what you're good at, that's what you're good at. Tighten your defence up and go forward and smash them."
Former unified champ Fury also revealed during the interview his next three fights planned for 2020, along with hilariously suggesting that fierce rival Deontay Wilder might have blocked his phone number.
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Featured Image Credit: PATopics: AJ, Tyson Fury, Boxing News, Andy Ruiz Jr, Anthony Joshua, Boxing, Gypsy King, BT Sport