"Every time you don't clean up after yourselves, we'll add another Justin Bieber song to the playlist."
This is the warning penned by Stefan Ekeroth, the manager at the Karlstad Atletklubb gym, who says he had to take drastic measures as his gym got messier.
"I'd noticed that people weren't keeping the place clean, and the 'your mother doesn't work here' signs weren't doing the trick," he told The Local.
Fed up with returning weights to the racks and cleaning the change room, Ekeroth pinned the Bieber sign to the wall.
And it worked.
"Nobody wants to listen to Justin Bieber when they're lifting 200 kilograms," he said with a laugh.
"It's not the right mood. You need hard rock, you need Metallica."
Ekeroth with his Bieber sign. Photo: Stefan Ekeroth
He said that since he pinned the sign to the wall, he has added ten Bieber hits to his random playlist of 700 songs.
"Whenever Justin Bieber comes on people yell out 'Oh my God, change the song', but I think they're learning what it means."
While Ekeroth admits he "has nothing against" Justin Bieber, who incidentally released a new album on Friday, he is well aware that there's a risk his gymmers might start to enjoy the music.
"I'm ready to add more music they won't like if they keep being messy. I was thinking about giving them a survey asking which music they like and which they don't like, then only adding the songs they don't like to my playlist."
The story is the second in recent months that sees Sweden's unusual relationship with the Canadian singer. In September, a man Swede woke up after a drunken night out with Justin Bieber's name tattooed on his backside.