The first rule of prison… what happens inside stays inside!
Lags are said to be holding secret bare knuckle scraps just like in the Brad Pitt movie Fight Club.
Inmates gamble on the outcome, while they also run books on everything from board games to poker schools.
READ MORE: 'Charles Bronson is not my dad but we made a lot of money together faking it'
Betting is a normal part of day-to-day UK prison life, says a report which examined the behaviour of 282 cons.
Researchers questioned inmates at an unnamed Category B men's jail, with convicted and on-remand prisoners covering a range of offences.
A total of 45% reported gambling, with activities that were bet on including "Fight Club".
The study was not able to find out details of what went on, but suggested it could mean organised or forced fights between prisoners.
Card and dice games were the most popular form of gambling among inmates, followed by sports bets and ball games.
The most common currency used in gambling was food, but drugs and cigarettes were also traded.
In the poll, 19% of prisoners had borrowed from other inmates to support gambling, with over half admitting they had not repaid the debt.
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The report, from the University of Lincoln, said the gambling among inmates showed "a need to provide a more appropriately stimulating prison environment".
Life on the inside was highlighted elsewhere with Charles Bronson, whose parole board plea for freedom was rejected.
Daily Star previously reported notorious lag Bronson had not been granted release from prison, while so-called son George Bamby revealed the pair were not related and had said they were to make some cash out of the situation.
Bamby's bombshell revelation confirmed that the father-and-son relationship between he and Bronson was complete fabrication and that the pair had "created loads of stories" and "done loads of ridiculous things" in their time together.
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