Well, it could be that Brittany started running as a way to get in shape. As she continued running, she gradually built up her endurance and distance. Maybe she joined a running group where she got the motivation and support to take on the challenge of a marathon. She might have also had a bet with a friend or family member which pushed her to train hard for it. And along the way, she overcame various obstacles like minor injuries and self - doubt.
Brittany is the main character in the story. She is the one who decides to run a marathon, which sets off the whole plot of her journey of self - improvement and discovery.
Yes. It is based on a real story. In the movie, we see Brittany's transformation from a party - going, out - of - shape person to a determined marathon runner. This kind of transformation happens in real life too. The movie takes the essence of real - life stories of people who have made such drastic changes in their lives and wraps it into an engaging and motivational story.