Swedish personal trainer Magnus Lygdbäck has helped Alexander Skarsgård train himself to the Tarzan body. Mark Ruffalo to gain 18 pounds in six weeks and and James McAvoy to build the back muscles it took to transform into The Beast in the movie "Glass" "Magnus said, 'We'll take away running in the morning and you'll get more food.' It felt completely wrong, but I just had to trust him.
And he was right," says Alexander.