Director Guy Ritchie felt King Arthur star Charlie Hunnam wasn't
muscular enough for the role (he had to lose a lot of weight for
the last drama series he acted in), and repeatedly asked him about
his weight.
Hunnam became impatient with Ritchie, "Bro, do you want to
ask me about my size one more time? You know what, stop the camera
(it was in the middle of the audition) because I'm starting to lose
my temper."
Knowing that Cavill (Superman), 34, and Courtney, 31, were both
being considered for the role too, he said: "Tell you what, I'll
fight them both at the same time for the role and we'll see what's
up with the fucking physicality!"
And Ritchie backed off, "All right, calm down, mate." and
gave Hunnam the role.
http://www.straitstimes.com/lifestyle/entertainment/tough-guy-act-got-hunnam-king-arthur-role