WATCH! Cowboy Cerrone knocks out star from ‘It’s Always Sunny in Philadelphia’

Rob McElhenney who plays Mac on the FX comedy series “It’s Always Sunny in Philadelphia” has been in the gym quite often with Donald “Cowboy” Cerrone and crew.

Cerrone posted a fun video to Instagram where it almost seems like the two are working on stunts and camera angles at the gym. Check out the fun video where Cowboy says a quick hello to McElhenney’s wife after knocking him out of site.

Do you know of any other celebrities that study martial arts? Let us know in the comment section below!