Mike Tyson Says He's Training Round The Clock For Jake Paul, 'I Take It Serious'

Mike Tyson's adamant his fight with Jake Paul ain't a money grab -- he says he's training round the clock to kick the social media star's ass this summer ... insisting this week, "I take it serious!" Iron Mike appeared on "Hannity" on Tuesday night to break down the upcoming tilt with Paul -- and he told the show's host, Sean Hannity, that he's living in the gym right now to make sure he's in incredible shape for…