Completing the badass look with a pair of black jeans, boots and dark shades, Theroux couldn't have looked cooler. Even his post-workout hair was on point.
While his buff physique is nothing short of impressive, it shouldn't be surprising. Theroux has frequently been shirtless on The Leftovers and showed off just how ripped he can really get in 2003's Charlie's Angels: Full Throttle.
In the flick, he played an Irish gangster (questionably named Seamus O'Grady) who spent years in prison getting fit.
However, his arms are even more impressive now, 14 years later.
Recently, Theroux opened up to Ellen DeGeneres about his Leftovers facial hair and dished on what his wife, Jennifer Aniston, feels about him growing out his scruff.
"She likes it, up to a point," Theroux explained. "She'll like it for about a month and then she's like, 'OK, you have to get rid of it.'" (We've got a feeling she's got no problem with those arms, though.) Check out the video below to hear more.