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Mike Tyson has undergone a radical transformation in his diet as he prepares for his comeback fight against Roy Jones Jr.
And the 54-year-old's training videos are proof that he has been hitting the gym hard ahead of Saturday's exhibition bout in Los Angeles.
He will face Jones, 51, over eight rounds at the Staples Center in a clash between two of boxing's greatest ever heavyweight world champions.
To prepare for his first fight in 14 years, Tyson has ditched the vegan diet that he stuck to for a decade – and is instead eating elk and bison.
The former undisputed heavyweight king turned to a plant-based diet in 2010 after his weight ballooned to a reported 27 stone following his retirement.
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But he told Joe Rogan’s podcast: “I stopped because of the training and because of what I wanted my body to look like and the strength that I wanted to poses."
Tyson was known to eat between 3,000 and 4,000 calories a day when he was in prime, and has been bulking up with meat ahead of his comeback.
“I only eat elk and bison – wild stuff – and I’m starting to feel fit," he said.
“I realised the stuff that’s good for other people – like kale, vegetables and blueberries – for me is really poisonous…. Kale will kill me!”
It's a sharp U-turn from his comments last year, when he said he wouldn't eat anything created "through any kind of intercourse".
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“I don’t eat anything that has a mother and father," he said in an interview with GQ Sports.
“If you were created through a mother and father, through any kind of intercourse, I won’t eat you.
“So that means I only eat vegetables and stuff.”
Tyson became the youngest ever heavyweight champion when he won the WBC belt aged 20, and he reigned as undisputed king of the division from 1987 to 1990.
Jones held multiple world titles in four different weight classes, and is the only boxer in history to be crowned heavyweight champion after starting his professional career at light middleweight.
Tyson has been hitting the gym hard ahead of his fight with Jones Jr
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And Tyson has gone to some extraordinary lengths to get himself in the best possible shape to fight his opponent.
He told rapper LL Cool J on SiriusXM radio that he started his regime with two hours cardio a day – but that's just standard for a man who used to get up for 4am run every morning when he was in prime.
After a punishing five-mile jog, Tyson would go back to sleep before getting up for breakfast at 10am, according to Bodhizone.
He would then go 10 rounds of sparring in the gym, before a session of strength exercises including squats, tricep extensions, pushups, shrugs with 30 kilos and neck crunches.
After lunch he would be back in the gym for more sparring, plus bag work and pads, an hour on the exercise bike and more strength exercises.
Mike Tyson was 20 when he beat Trevor Berbick to become the youngest ever heavyweight champion
(Image: Focus on Sport/Getty Images)
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In the evening there would be more yet more strength exercises, plus a boxing session focusing on a particular technique, before dinner followed by a recovery session on the bike.
When in camp Tyson would go through that punishing schedule six days a week – and to look at his training videos he appears to have been returning to his former methods.
Rather more unusual, however, is the stem-cell treatment Tyson says he has been undergoing.
Usually used to treat certain cancers, Tyson claimed it had left him feeling like a “different person.”
“Six weeks of this and I’d be in the best shape I’ve ever dreamed of being in,” Tyson said in quotes reported by the New York Post.
“As a matter of fact, I’m going through that process right now."