Float like a butterfly, sting like a Bieb...
Check out this video of Justin Bieber boxing shirtless (calm yourself people) in New York City. The coach is not identified but the video shows Bieber doing some light sparing in a gymnasium.
Bieber originally posted the videos on his Instagram.
Is he taking a new career path or just getting in some exercise? Or perhaps he's getting so tips on how to handle those unruly fans?