Since March 2023, Corenswet has been married to actor Julia Best Warner, whom he met at an acting summer camp when he was still a young boy. Though their wedding was years ago, the pair only made their red-carpet debut this week, at the Los Angeles premiere of Superman. Warner and Corenswet also have a one-year-old son.

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.