Gone are the days when Bollywood films were just about running around the trees and dancing on rooftops. Audiences have definitely evolved and they expect some good cinema, period. With the changing times, certain actors have gone to great lengths to get under the skin of their characters. Acting is an art form, people, and a fair amount of our leading ladies and men take it very, very seriously. and get it right. Here are some stories of Bollywood stars who pushed themselves for the sake of their roles.