Christian Bale has dropped out of a film, and sources say it's because he couldn't gain weight fast enough. Bale was due to star in Michael Mann's Enzo Ferrari movie, a biopic of the titular character set in 1957, but has left the production over, officially, health concerns. Sources tell Variety Bale had to gain weight in order to play the auto maker, and started the process, but didn't think he could safely get to the weight needed by spring, when production starts. Deadline reports that Mann is talking to other "heavyweight" actors as potential replacements. (Watch Bale "make out" with a bunch of people after winning a Critics' Choice Award Sunday night.)