Los Angeles Times

If you’re looking for tips on how Chris Evans went from brawny to scrawny in the upcoming movie“Captain America: The First Avenger,” you’ll need to pull back on the protein shakes and pick up some Photoshop skills — it took a lot of special effects to make the toned actor look like the skinny military hopeful he’s supposed to be at the beginning of the story.

“It’s pretty amazing,” Evans told Reuters. “They took shape out of my jaw line, they shrunk my skeleton and they made my shoulders less broad.”

Those rippling muscles on his Captain America alter-ego, however, are anything but CGI — the actor put on 15 pounds of muscle to play the part.

Want to find out how to get that superhero physique? Health writer Jeannine Stein talks with personal trainers to the stars of “Thor” and “Green Lantern” to explain how they sculpt the actors’ bodies to fit their roles.