Among the many reasons to see "Avengers: Age of Ultron" this weekend, here's a big one: Inspiration. Not to become a superhero yourself, mind you, but to get a superhero bod. Take one look at the heavily muscled cast, from Captain America to Thor and beyond, and you'll want to work out so hard that you can't even recognize yourself in the mirror.
In fact, even the Avengers themselves might not recognize what they see in the mirror. We asked the main cast members of "Age of Ultron" to identify each other based purely on pictures of their muscles, and the results were not as straightforward as we expected.
See Earth's mightiest heroes take our mighty muscle quiz:
"Avengers: Age of Ultron" hits theaters on May 1.