Earlier this year, Mike Tyson broke the internet with a 30-second clip of himself in shape and punishing the pads with a quickfire burst of punches.

But the former undisputed world heavyweight champion has admitted the sheer effort of that cameo left him bedridden for a week.

Tyson has since sharpened up as he prepares for a high-profile, eight-round exhibition fight against four-weight champion Roy Jones Jr. at the Dignity Health Sports Park in Carson, California, on November 28. 

But the 54-year-old was candid about the repercussions of his ‘comeback’ video, fifteen years after his last ring appearance against Kevin McBride (LRTD6) in 2005.

“Let me tell you something about [that training video]. I did that video and I was in bed for a week,” Tyson told Joe Rogan. 

“That was 30 seconds and I was in bed for a week. That was not funny because it made me realise that this is big boy shit.

“Getting in shape and getting conditioned are two different animals,” Tyson continued. “They don’t even belong in the same division of working out. Getting in shape is getting able to fit in your clothes. Being in condition is being able to come outside of your soul. You can’t do that automatically. The emotional state to prepare for that is mind boggling.”