Physical training can also be bravely continued filming a challenge. Steven Spielberg during the six weeks it took wanted to show the real horror of war in Saving Private Ryan (1998) and he wanted his actors to feel like real soldiers. So he sent a group of them, including Tom Hanks, to a 10-day military boot camp. [a] They ran miles every day, slept outside in the freezing cold, and were given little food. In the end, all of them were physically and mentally exhausted. Natalie Portman also had to make a great physical effort when she got the role of a ballerina in Black Swan (2010). Before filming, she spent a whole year training for eight hours a day, six days a week in crder to leam to dance. Once filming began, things didn't get easier either. Portman dislocated a rib while dancing. Nevertheless, she bravely continued filming during the six weeks it took her to recover.