Corenswet's physical trainer breaks down the routine that helped the formerly svelte actor put on 40 pounds of muscle—and how he got Nicholas Hoult prepped for Lex Luthor.

If you ask me, the cure for superhero fatigue isn't eliminating the genre altogether — it's creating unique and passionate stories that viewers will care about. Because that's the issue: people just don't care anymore!

To transform into the Man of Steel, ‘Superman’s David Corenswet hit the gym and overhauled his diet to be protein heavy. Here's how he bulked up, up and away. James Gunn’s first DCU movie flies into theaters on July 11.