Gaining muscle is no easy feat. And while a great workout routine is undoubtedly a cornerstone of improving your overall physique, a lot of guys often miss the other pillar of bodybuilding: nutrition and recovery.

See, every time you put your muscles through the wringer, your body has to rebuild them a little stronger—and that requires raw material in the form of protein. So if you're trying to power up your build, then make sure you're working these 12 protein-rich foods into your diet. (And then get back to the squat rack.)