Deontay Wilder has taunted Tyson Fury and told him to "get your weight up" ahead of the third meeting between the pair next month.
Wilder took to Instagram and posted a video of himself bench-pressing 310lbs in the gym in a response to Fury's claims he would run Wilder over as if he was an "18-wheeler and he's a human being".
"I'm going to be a train. You said you're a semi-truck. I'm going to run you over with a train," Wilder said on Instagram.
He accompanied the threat with a written message for Fury to pile on the weight after lifting more than Fury's bodyweight in the gym.
And that is exactly what Fury has been doing the last few months.
In their rematch last year, Fury came into the clash at 273lbs. That was some 19lbs heavier than the 254lbs that he weighed for their first fight in 2018.
Unbeaten Fury has been bulking up and will likely top 300lbs at the weigh-in next month as he aims to run over his older opponent at the T-Mobile Arena in Las Vegas on July 24.
Fury, 32, has not been shy in revealing his game plan for the trilogy fight. He did as much ahead of the rematch. The 'Gypsy King' said he would knock out Wilder at the MGM Grand and he delivered by stopping (TKO) Wilder in a one-sided contest in which he overpowered his rival.
He dropped Wilder twice and Wilder's corner threw in the towel in the seventh round to stop the Alabama native taking more punishment.
It appears that Fury is planning the same again next month and Wilder's response has been to hit the weights.
ESPN Ringside recently described Wilder as "shredded" after a clip of the fighter training on Twitter was posted by new trainer Malik Scott.
Scott said recently, via MMAUK.net: "We built a facility to do a licensed homicide.
"Deontay Wilder is not playing. He built a facility to get this job done. When he wakes up and rolls out of bed it's right to work. Everything we're doing he's right to work."
"I've never seen it before from him like this at this level. I'm proud of him already for what we're about to get done."
Wilder will have to come with a different game plan this time and speed and power look like being at the forefront of that.
Of course, Wilder's right hand will still be his most potent weapon. And if the American can land one of the biggest punches in the heavyweight division then Fury could be in trouble.
Fury's increased mass is certainly not going to aid his mobility, nor will it increase his punch resistance.
Fury will be banking on Wilder being the sitting duck he was in the first two fights. If that's the case then Fury's superior weight will come in to play and Wilder's night could be over very quickly.
But all the bluster from the Wilder camp suggests the former WBC heavyweight champion has been training hard.
Shelly Finkel, co-manager of Wilder, says his man is in terrific shape.
"I see someone who is really focused on this fight," Finkel told Sports Illustrated . "He's training like I wish he had earlier.
"He is training like he has never trained before for a fight. We thought we were going to get the fight months ago. We had to win [arbitration] to get it. All along he has been training."
Wilder's focus was so much so that the recent press conference was a non event.
"He didn't want to get into it with Fury at the press conference," Finkel added"What's on his mind right now is just fighting Fury. If Fury wants to talk, let him talk.' He just wants to fight."
Wilder sat silent with his headphones on and even at the face-off he chose to ignore his 6ft 9in opponent.
Wilder 'is out of character'
It was "out of character", according to former two-weight world champion Andre Ward.
"I didn't like the headphones from Wilder, but that's the strategy he's taking and we're going to find out if it works or not," Ward told fighthype, via Boxing News 24/7.
"Fury has basically been doing what he's been doing, talking his talk and he tends to back it up," said Ward.
"Wilder is out of character in a sense that he's not his normal self, but we got to see if this new tactic of tuning the world out and tuning Fury out will works.
"We're going to find out in a month from now. I don't think he has a better chance. I think he has the chance that he's always had.
"He's dangerous, but I think he's always going to be dangerous," added Ward.
"But in this fight I think he's going to be dangerous in a different kind of way because of the circumstances. He's got a lot to prove."