Mike Tyson revealed he was too tired to go to the gym during his jail sentence in the 1990s - as he was having too much sex.
'Iron Mike' served three years of a six year sentence after being convicted of rape, but didn't serve a typical sentence.
The 53-year-old has admitted he was troubled during his boxing career and it was clear to see during his time behind bars.
Speaking in his autobiography 'Mike Tyson: Undisputed Truth', he admitted per The Sun: "I was having so much sex that I was too tired to even go to the gym and work out. I'd just stay in my cell all day."
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'The Baddest Man on the Planet' has also discussed his womanising on his podcast, Hotboxin' with Mike Tyson, in recent years.
"You can't f*** girls like you used to when you were young," he explained.
"You can't be having bitches around like you do when you were young. They f*** up money, I didn't know that.
"They were fun then, but when you're older they ain't fun no more. F***ing all day ain't fun no more, you want some f***ing money, you know what I mean."
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Money problems followed the former world champion for his whole career, despite raking up a reported fortune of $300 million.
"When I was young I was an animal with money," he explained to NBA star Damian Lillard.
"Giving people money like f*** everybody, party with everybody and f*** their mothers, their sisters and their cousins... orgies. I was crazy.
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"I was so sick and I had no idea I was so sick. I bought a lot of cars for girls too."
Tyson has turned his life around and is now prepared to step back into the ring for the first time in 15 years.
Aided by switching to a vegan lifestyle, his turnaround has been remarkable and he has now whittled down to 230 pounds.
"I'm feeling better than I've ever felt in my life. God has been merciful to me man. I'm gonna get on with it, I'm looking good," Tyson said to rapper Lil Wayne on Young Money Radio.
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"Yo Wayne, I'm 230 right now! Man, I'm just getting ready you know, I'm just getting ready to help some people less fortunate than me. I'm gonna do this charity event.
"I'm going to take this money and help these homeless and we're going to help these addicted brothers. Because I've been homeless and I've been addicted so I know the struggle. Not many people have survived like I did."
Featured Image Credit: PA Images & Mike Tyson/InstagramTopics: Mike Tyson, Boxing News, Boxing