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.

“She helped me make my first self-tape for the part, and she felt at that point that I should get the part,” he recalled in a People interview.

This story discusses major plot developments, including the ending, in "Superman," currently playing in theaters. In the climax of "Superman" - the first feature film under the DC Studios banner, and the official big screen launch of the new DC Universe - the city of Metropolis is split in two.

DC Studios president and Superman writer-director James Gunn is considering spinoffs centering on Mister Terrific, played by Edi Gathegi, as well as Jimmy Olsen, played by Skyler Gisondo.