Here is some training advice from Scott Adkins, culled from the end of audio interview on Muscle&Fitness:
... if I have to put muscle on for a movie, I think just your basic volume training, you can't fail with that. ... I've tried a lot of different ways to pack muscle but for me it's eating a lot of food and volume training with a three day split in the week, or a four day split in the week.
... for me there's no secret to it. You've just got to train hard. If you can push yourself every time you go to the gym, then you're going to see your body change. There's no secret to it. It's just hard work. There's no quick fix.