Comic-Con 2012: Jessica Biel Spills Her Workout Secrets for 'Total Recall' Role (VIDEO)
"I did a lot of martial arts training, specifically boxing," Biel, 30, told Celebuzz at this year's Comic-Con in San Diego, Calif.
In the flick, Biel plays a Melina, a member of the Resistance who helps Colin Farrell's character get out of "really tight situations."
How did she prepare for those physical scenes with the 36-year-old Irish actor?
"Colin and I did a lot of parkour work, which was really fun," said Biel.
Developed in France, the technique involves participants how to move through their environment by vaulting, rolling, running, climbing, and leaping.
Celebuzz also caught up with Farrell that day, who gushed about just how tough Biel and costar Kate Beckinsale really were.
"They are very, very tough ladies. They are two scrappers. I was just glad I didn’t have to fight Jessica," he told us.
“Don’t be fooled by the long legs and elegant heels,” he added.
Total Recall hits theaters August 3.
For more Total Recall at Comic-Con coverage, watch the videos below.