Tyson, known as the Baddest Man on the Planet, looks as shredded at 54 as he did throughout his professional career, which saw him become the youngest heavyweight champion in the world.
Fans seeing the images couldn't believe their eyes, with many fearing for the safety of Jones Jr.
"Been following @MikeTyson for my entire conscious life and covered his last two fight weeks in '04 and '05 ...0 he is in a different kind of shape this time around," ESPN radio host Peter Rosenberg wrote.
ESPN's Ariel Helwani was a bit more direct: "Bro".
Dallas Cowboys writer Clarence Hill Jr wrote: "Don't do it Roy".
Professional wrestler Brent Tate wrote: "That's a badddddd mofo".
Both fighters are preparing for a bruising encounter, but were left unhappy with the decision to use two-minute rounds, saying they would have preferred to fight with the longer three-minute rounds.
"I'm sure they have their reasons for doing it," Tyson said. "But you know, women fight for two minutes. But I guess the commission has a bigger influence than I do. I'm just happy that we're doing it."
Jones was more critical. "I'm not happy at all," he said. "That's for women. Why we doing two-minute rounds? We're two of the best to ever do it.
"Two minutes doesn't do anything for me or him."
