 After Jolie had just given birth to twins , she spent time training before filming to get fit in order to perform almost all of the stunts herself . Bonaventura said , " She is so prepared and so ready and gung @-@ ho , she 'll do any stunt . We had her jumping out of helicopters , shooting , jumping off of all sorts of things and infiltrating places that are impossible to infiltrate " . Salt 's fighting style was described as a mixture of Muay Thai , Shaolin Kung @-@ Fu , & Jeet Kune Do , which was considered by the stunt team the most fit for Jolie 's physique , and Krav Maga , for its rawness and aggressiveness . Noyce wanted to film the scene where Salt hangs from the edge of the building in a studio with chroma key , but Jolie insisted on doing it herself in the actual location . On May 29 , 2009 , filming was temporarily halted after Jolie suffered a minor head injury during filming an action scene . She was taken to a hospital as a precautionary measure and released on the same day with no serious injuries , allowing filming to resume . Salt 's escape after being captured in St. Bartholomew 's originally involved jumping her off a building into a window cleaning machine , but budgetary constraints caused the scene to be changed into a car chase . 
