Ladies, allow me to introduce you to Chris Hemsworth, star of the upcoming film “Thor.” Which guy? You mean, is Chris Hemsworth the guy on the left or the right? Oh, he’s both. On the left, Chris before he beefed up for the role. On the right, Chris after he channeled Cartman from “South Park” and screamed “Beefcake! Beefcaaaaake!” into a mirror while pumping iron. In the end, thanks to a combination of stuffing his gut and lifting weights (if you’re interested in the details, read Men’s Health), Chris gained 20 lbs. of muscle. Look at those guns. Hot. [Huffington Post]
For the most part, Hollywood actors work out. Many of them have nicely maintained physiques on the regular. But even your average Hollywood hottie has to take the muscles up a notch for certain roles. Here are 12 other already drool-worthy actors who beefed up for their craft…

















