Henry Cavill was on The Tonight Show last night to promote his new movie The Man from U.N.C.L.E., and naturally host Jimmy Fallon wanted to ask about Superman. The two joked about how Cavill bulks up to play the Man of Steel, and his preferred method of cardio as well.

But more interestingly, Cavill confirmed that he begins pre-production on Justice League Part One in January. As was reported in Empire last month, Justice League Part One will begin shooting in the spring of 2016.