How can muscles even look like that?
Zac Efron must be hitting the gym ALL THE TIME these days, and sure enough, the Neighbors 2 star shared a new buff as hell snap with his fans on Thursday, captioned, "Back and bi's #baywatch."
PHOTOS: Hollywood's Sexiest Shirtless Men
If it seems like Zac is trying to compete with Dwayne "The Rock" Johnson at this point, he basically is. The two are set to star in the Baywatch reboot, which is a real thing that is set to be happening next year.
The 28-year-old actor may have a ways to go before he catches up, however, seeing as The Rock still has a (gigantic) leg up on him...
WATCH: Zac Efron's Abs -- and Booty! -- Have Never Looked Better
Dwayne did, however, take some time late last year to compliment Zac on one very specific part of his physique....
WATCH: Zac Efron Shows Off Insane Biceps (and Abs) in New Candid Pic: 'I Woke Up Like This'
Watch the video below.