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.

Corenswet prepares to leave his relative anonymity behind as he steps into the red boots of the most popular superhero of all time.

Getty Images for CinemaCon David ... Corenswet revealed that he was ready to be identified with Superman for the rest of his life. “Would this be worth doing if this was the only thing I do as ...