Justin Bieber has always been a skinny, little cutie.
But now he's growing himself a man's body!
He recently shared a pic (above), showing his impressive strength, and wrote:
"#ogr what a solid core . Lol #stayfit #dontbescared @thepatricknilsson"
That def takes one seriously solid core to make holding that position look that effortless!
He's tweeting at his personal trainer, Patrick Nilsson, btw.
We guess that's a bit of taunt… maybe even a challenge?? All we know is, we're so glad to see Justin taking fitness so seriously!
Keep those sexy results coming, Biebz!
[Image via Instagram.]