Salt How Strong Does Jolie Look?

I went to see "Salt" yesterday and spent most of the film wondering how it is actually possible for a woman who is so thin to, cough, be so strong?

Schreiber and Jolie in Salt credit Hollywood Chicago

I do appreciate that it's just a film - and that Santa isn't real. But seriously, could they not try to build her up just a little? Liev Schreiber is not a small guy but she takes him out. Plus dozens of agents on the side. Okay, she sweats a little over it but seriously, if guys were this easy to beat up, we'd all be world champions. To be fair she trained in MuayThai and Krav Marga to get ready but ...

Am I being too picky - do I need to just work on the 'suspension of disbelief' and get on with the popcorn?