Knock Outs (2011)

When call girl Cindy gets busted under the new 36 Strikes Law, she receives the maximum sentence of "Life in Prison without Parole". Desperate to beat the rap, Cindy agrees to become a Special Agent for the Feds on the condition that she infiltrates the illegal Female Fight Club that exists in the prison. What happens next is the sexy fight of her life as she uses her skills to get inside the club and bring it tumbling down.