In an interview with MTV, Ashley Greene explained some inside facts about filming Eclipse. 

The actress talked about how hard the battle scenes between the werewolves and the Cullen’s against the neophytes. All the actors who will play roles in the battle scenes have been working out a lot because they need to have a finely toned body as the battle scenes call for lots of gymnast-like movements which are complex. Ashley said that she has never had to work so hard in her life, and many times she leaves the set with bruises!

Ashley also spoke about Eclipse's director, David Slade and his own vision of the project. Eclipse has more action, is darker, and is bloodier than the first movies, which were all about the love between Edward and Bella.