Boxing legend, Mike Tyson has shown off his insanely toned physique while throwing his signature fast punches in a new video The 53-year-old former professional boxing champion was shirtless in the new video shared on Chinese social media site Weibo, as he threw punches while signalling he is back to boxing.   Tyson recenlty came out to reveal that he was coming out of retirement to stage a boxing comeback for charity and uploaded a video on his instagram page last week …