Tyson, 54, returns to the ring this Saturday when he faces fellow boxing legend Roy Jones Jr in an exhibition bout.
He's ditched meat from his diet for his return and also spent up to TWO hours on the treadmill after advice from his wife.
Speaking on Good Morning America, he said: "It was difficult, but only for one particular reason: because I had to lose 100 pounds.
"But other than that, I've always done this my whole career."
Heavyweight champ and movie star @MikeTyson is headed back to the ring!https://t.co/5q7bcCRpIU pic.twitter.com/OCZ2PltMhd
- Good Morning America (@GMA) November 23, 2020
When asked how he lost all that weight, he replied: "I became a vegan."
He added: "My wife [Lakiha Spicer] told me to get on the treadmill. So I went from 15 minutes on the treadmill and I winded up ending at two hours."
Tyson was linked with a host of fighters, including former foe Evander Holyfield, before opting to face Jones Jr.
And the rules have been laid out which equate to a hard sparring session between the American boxers.
Dana White's reaction to finding out Mike Tyson vs Roy Jones Jr news is priceless. https://t.co/a7WZAWiHvV pic.twitter.com/xnF7MHkwOa
- SPORTbible (@sportbible) November 23, 2020
No knockouts are allowed with Tyson insisting he'll be protecting himself at all times.
He continued: "I'm not trying to knock nobody out, but I'm trying to protect myself at all times."
Tyson hasn't fought since 2005 when he suffered a crushing defeat to Kevin McBride.
As for Jones Jr, the 51-year-old last fought in 2018 when he outpointed Scott Sigmon.
Featured Image Credit: Mike Tyson/PA
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