He was once super skinny but Justin Bieber has been cutting a brawnier figure in recent months.
The pop star has achieved his buff look through lots of exercise and he is determined to maintain it.
Justin enjoyed a trip to Barra de Tijuca beach with his entourage on Tuesday while in Rio de Janeiro, Brazil, but still found the time for a quick workout.
The 19-year-old was seen doing some pull-ups on a set of bars he found, wincing as he lifted his body weight.
The Biebs was wearing a baggy black top, printed blue and white shorts, black trainers and a red baseball cap with the word ‘Krew’ written across it.
Justin, who covered his face with wayfarer sunglasses, was spotted sipping on a sofa as he headed back to his accommodation with his pals.
In the early hours of that morning, the Beauty And A Beat hit-maker had sprayed a £23million hotel wall with graffiti, writing the words ‘Beliebers 4 Life’.
An inquiry has been started into the 'act of vandalism' by the singer and a police spokesman said the Canadian could be arrested when he next tries to enter Brazil.
In fact Justin had quite an eventful trip to the country, which he jetted out of later that day.
He was spotted sneaking out of a brothel over the weekend while covered in a bed sheet, identifiable by the tattoo on his arm.
And a Brazilian model and bodybuilder named Tati Neves filmed him while he was sleeping and posted the video to Youtube on Wednesday.
When contacted by MailOnline, Bieber's representatives declined to comment.
However, an insider reveals to MailOnline: 'Justin was asleep in his villa when the video was taken.
'There were a bunch of guys and a bunch of women hanging out, not prostitutes. He fell asleep and someone walked in and took a picture.'
And Justin didn’t have a swift exit when he left the estate he had been staying in, as fans slipped past security and ran after the car he was being driven in.
Justin, who is currently on his Believe tour, is now in Buenos Aires, Argentina.
The popstrel has been working hard with trainer Patrick Nilsson to turn his puny body into an impressive physique.
‘I can’t keep him out of the gym,’ Patrick told In Touch of the star, who used to never lift weights and wasn’t ‘really eating much’.