News Justin Bieber Arm Wrestles Shirtless -- Watch! By Jennifer Drysdale 1:27 PM PDT, June 17, 2017 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 ConcertView this post on InstagramA post shared by Justin Bieber (@justinbieber) The Biebs also gave fans a close up of his game face with a few silly selfies.View this post on InstagramA post shared by Justin Bieber (@justinbieber)View this post on InstagramA post shared by Justin Bieber (@justinbieber) RELATED: Luis Fonsi Says Justin Bieber Deserves a 'Pass' for Not Knowing the Lyrics to ‘Despacito’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.Did Justin Bieber Just Get Some Massive New Ink? This video is unavailable because we were unable to load a message from our sponsors. If you are using ad-blocking software, please disable it and reload the page.