Mark Consuelos Trolls 'Riverdale' Co-Star KJ Apa By Flashing His Eye-Popping Washboard Ab

Two generations of "Riverdale" heartthrobs! While KJ Apa certainly has his fitness on lock, Mark Consuelos proved to his younger co-star that he's still got it. See the hilarious way Mark flaunted his muscles behind the scenes of their CW show.