Actress Jessica Biel is convinced she could take care of herself in a physical confrontation, thanks to the training she's received on action movies. The 25-year-old admits she is in such great shape she feels "unstoppable". She says, "If somebody were to mess with me, I'd feel very confident after all the training that I've had. I'd probably draw on some of the defensive stuff I learned on Blade. "I do sort of feel unstoppable."