This is How KJ Apa Preps For Shirtless 'Riverdale' Scenes (Video)

KJ Apa sure has an interesting way of getting into character as Archie on Riverdale.

The 20-year-old actor posted a pretty funny Instagram video where he’s in front of the mirror and grunting while shirtless.

PHOTOS: Check out the latest pics of KJ Apa

“Preparation is essential for a good performance,” KJ captioned it.

When he “realizes” he’s on camera, he runs after the person filming. (It’s gotta be Cole Sprouse, right?!)

Pictured: KJ keeps it casual in his favorite cap while enjoying a day off from filming on Sunday (June 25) in Vancouver, Canada.