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.
At first, Bieber 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.
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