In the film, Angelina Jolie is a very fast runner. There are other actors, like Liev Schreiber and Chiwetel Ejiofor, who are less fast runners. They try to run as fast as Angelina, but they can't. They even try to cheat by using cars and helicopters but she just runs and runs and they can't catch her.
Even though Angelina is clearly the fastest runner, she likes to keep things interesting. So sometimes she slows to a brisk walk or a jog, to give Liev and Chiwetel time to catch up before running again. This helps build dramatic tension and keeps the viewer engaged in all the running.
Angelina is also a tricky runner. She not only runs on semis and buildings, she also changes running clothes and hair and eye color frequently, just to keep the other runners guessing. She even changes into a man briefly, although I found this mostly distracting because I kept wondering where her boobs went.
It's easy to root for Angelina, because she is so passionate about running. At the beginning of the film, Kim Jong Il has locked her up so she can't run. It is very hard on her because she misses running so much. At another point, she tries to take her dog for a walk, but the dog is too slow for her so she stuffs it in her backpack instead.
In a surprising twist, you find out that Angelina is part of a large group of specially trained Russian runners sent to America to run and show how Russian runners are better than American runners. Angelina runs to try and impress the Russian president, but these days Russians don't care about running like they used to, so she runs to impress the U.S. president instead. Unfortunately he falls asleep during the best part of her running, so she ends up running for herself instead.
I highly recommend this film for anyone who loves running or who wants to see Angelina Jolie dress up as a man. You will not be disappointed.