What do actors do in order to increase their muscles to be able to play certain roles?

Anabolic steroids are definitively administrated by different actors. You can observe obvious changes in physique of actors in short time. For example, a certain actor has played a role in a film, being quite thin, then, after short period of time he plays a role with enhanced muscles. How may actors increase their muscle size in short time? The answer is clear. They use anabolic steroids. But actors deny that they administrate performance-enhancing drugs.
Jason Momoa in “Conan the Barbarian”, Chris Hemsworth in “Thor” and Chris Evans in “Captain America: The First Avenger” enhanced their muscles essentially to play certain roles. Undoubtedly, this fact led to questions about intake of steroids. But the actors refused to answer the questions connected with administration of medications that possess performance-enhancing effects.
It is known that Jason Momoa increased his muscle size by 30 pounds to play Conan. An actress, Rose McGowan, who also played in “Conan the Barabarian” said that Momoa achieved that results not due to steroids. Jason Momoa said that he desired to correspond to a Frank Frazzeta painting without steroid use. It would be ideally, according to this actor. But he mentioned that our world and life were not ideal. Momao confirmed that he had trained a lot. Moreover, this actor followed a strict diet. He consumed broccoli, peanut butter, yams and chicken breast continually.
As for Chris Hemsworth, this actor enhanced his muscle size by 20 pounds to be able to play Thor. Chris Hemsworth said that he had eaten very much. The actor said that he had eaten and he seemed as if he were busy with an important thing. He claimed that it had been very difficult to eat, when he didn’t want. Moreover, Chris Hemsworth had to eat large amounts of food. According to his words, it was too tiring.
It is interesting to note that Hemsworth never lifted weights before playing his role in “Thor”. Couldn’t you find this aspect unreal without administration of steroids? Nevertheless, the actor confirmed that he hadn’t used anabolic steroids.
Chris Evens also induced muscles dramatically in order to play Steve Rogers in the film “Captain America: The First Avenger”. He said that he had induced muscles due to trainings and a strict diet.