Even though Charlie Hunnam was only attached the 'Fifty Shades of Grey' film adaptation for a matter of months, more than a year ago, the British actor has found himself once again explaining why he decided to walk away from the role.

Charlie Hunnam
Hunnam admits he would have been a "f--king disaster" as Christian Grey

Nearly a year on and the 34 year-old actor is still finding himself having to explain why he suddenly exited the movie adaptation of E.L. James' erotic best-selling novel, an while speaking with the December issue of Men's Health, which he features on the front cover of, Hunnam said he would have been a "f-----g disaster" as Christian Grey.

"I was going to finish playing a psychopath who'd just lost his wife, and five days later I'd be on set playing Christian Grey," he told the mag about only having 48 hours after finishing the 'Sons of Anarchy' season 6 finale to prepare for the lead role in 'Fifty Shades of Grey.' "I was like, 'This is going to be a f-----g disaster.'"

More: Charlie Hunnam Recalls "Difficult" And "Painful" Decision To Pull Out Of 'Fifty Shades Of Grey' Role

Hunnam dropped out of playing Christian Grey just weeks before production was scheduled to start, shortly after the movies' producers replaced him with Irish actor/model Jamie Dornan to star alongside actress Dakota Johnson's Anastasia Steele.

But maybe fans may have wished the 'Pacific Rim' actor would have kept the role after finding out how he keeps his impressive physique. "I go into the gym and do 75 pull-ups, 75 dips, 150 squats, 150 push-ups, and then 20 minutes of ab work," he said. "Done. It takes an hour; I'm in and out. I sweat the whole time."

More: "Sons Of Anarchy" Creator Stays Vague About Final Season At Hall H Panel

'Fifty Shades of Grey' is slated to hit theatres on Feb 13th, 2015.