Los Angeles - Charlize Theron regrets not training harder for Prometheus.
The 36-year-old actress - who plays corporate figurehead Meredith Vickers in the Ridley Scott-directed sci-fi movie - felt out of shape while filming "sexy" running scenes because and thinks they turned out looking more "ugly" than attractive due to her lack of preparation for the role.
She said: "I probably should have trained a little bit because I found myself in the middle of Iceland having to run with all this heavy gear on my back. It was one take of sexy running and then I was all ugly running.
"Ridley going, 'Run. Run!' was pretty much the ugly running."
Charlize found her transformation into a hard-nosed businesswoman in the motion picture - which follows the crew of the Prometheus space ship in 2085 as they go in search of aliens - came to her naturally as soon as she donned a suit.
She added to Hello! magazine: "I don't ever set out to play a character with strength. I try to kind of find the circumstance and try to be as honest as I can.
"Once we all understood the world which she [Meredith] was in, where we wanted to go with her, and what we wanted to explore with her, that seeps in and you all of a sudden put that suit on and are like, 'Wow, yeah, I wanna order somebody around.' And you just kinda find it."