The key for me was I didnt want to look like a broiler, Skarsgard says.

I didnt want to look like someone from Venice Beach, that sort of Golds Gym look.

But it wasnt all intense workouts.

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Credit: Jonathan Olley

Skarsgard also had to meticulously watch his diet, eating small portions of protein every few hours.

I remember the day that he was allowed an apple, and he kissed the apple, Robbie says.

It hit me how deprived you are if youre that excited to see a piece of fruit.

The only bright side to that strict diet was that it does make a man appreciate the simple pleasures.

I spent four days just in bed, being fed by Dad, he says.

He cooked these pastas with rich sauces and bone marrow and fried mozzarella and tons of beer and wine.

It was the most incredible weekend of my life.