Throwback Thursday: Hollywood Edition

Everyone from here to Timbuktu knows Dwayne “The Rock” Johnson is basically as buff as bodybuilders come.

But did you know he was almost as Herculean even when he was as just a teen? Turns out, it’s true. The wrestler-turned-movie star proved muscles run in his genes with a Throwback Thursday snap: him as a ripped 15-year-old.

“We all start somewhere,” he tweeted. “Throwback Thursday. #BoomBox #CreepyMustache #CaptainWhiteShorts”

The vintage photo captures The Rock posing in nothing but white shorts, showing off his broad shoulders, super-taut six-pack, and bulging biceps. And for the folks out there doubting the date of this image, note the old-school boombox, his full head of hair and, best of all, his scruffy mustache.

Look back at where other stars started out in Celebuzz’s Throwback Thursday: Hollywood Edition, a weekly roundup of some standout snaps that your most beloved, shutter-happy celebrities are hashtaging in the social media sphere.