Justin Bieber Arm Wrestles Shirtless -- Watch!

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Instagram

Justin Bieber has been hitting the gym!

The 23-year-old singer took to Instagram on Saturday to show off his late-night activities: shirtless arm wrestling!


WATCH: Justin Bieber Dodges Hurled Water Bottle After Refusing to Sing 'Despacito' in Concert

The Biebs also gave fans a close up of his game face with a few silly selfies.

A post shared by Justin Bieber (@justinbieber) on

A post shared by Justin Bieber (@justinbieber) on


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On Friday, Beiber debuted a new tattoo, reflecting on his past mistakes and explaining that he wants to "work everyday to be BETTER AT 70."

See more in the video below.