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Justin Bieber Goes Topless, Works Up A Sweat In The Boxing Ring

Watch 'The Champ' Floyd Mayweather Jr. put Biebs through his paces right here...

Justin Bieber has been busy flexing his muscles in the gym, going topless for a boxing session with world champion Floyd Mayweather Jr.

The All That Matters singer took to Instagram to show off his toned torso as he trains with Mayweather, with the star working up a sweat in the boxing ring.

@floydmayweather is my trainer

At first, Biebs posted a still of Mayweather helping him with his boxing gloves, accompanied with the caption: "@floydmayweather is my trainer."

A video of their session then followed, showing Justin ducking and diving out of the way of Floyd's fists, with the star also displaying some impressive moves on a trainer from the Ten Goose gym.

[related]In another video shared on Vine, Justin looks a little red in the face as Mayweather puts him through his paces.

JB has been a dedicated follower of Mayweather's for a while now, with the Baby hitmaker even supporting him at his fight against Canelo Alvarez in September.

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