The 'Jackass' alum downplayed his boxing prowess, sharing what’s really important is 'trying to learn new things' Gregg DeGuire/WireImage; Johnny Knoxville Instagram Johnny Knoxville showed off his ...
Johnny Knoxville showed off some impressive biceps — and boxing skills — while hitting the speed bag at the gym. The Jackass alum, 54, posted a video to Instagram on Saturday, Aug. 9, of himself ...
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