Jake Gyllenhaal [1]'s latest role as a boxing champ in Southpaw wasn't one he was sure he could do. When we sat down with the actor in LA, he talked to us about self-doubt, why his character's tattoos haven't inspired him to get any of his own, and the surprising fact that he ended up taking over for Eminem [2] in the role of Billy Hope. Catch Southpaw in theaters starting July 24.