To prepare for the role, Jaden trained for three months in the United States and then three hours a day for four months once they moved to China. But martial arts weren't totally new to him. He'd been taking karate lessons since he was 3 years old. "I was pretty ripped [before filming]," Jaden says. "But I wasn't as ripped as I am now."
In the film, Jaden plays the new kid in school who's bullied by his classmates, but he says he's never had to deal with getting picked on in real life. "I've basically known karate my whole life, so usually at school nobody messes with me," he says. "But I could feel how they felt because I could see a lot of people get bullied. ... Once you can understand it, you can be it."
The movie isn't all fighting and training, though. Jaden also had his first onscreen kiss. But he says that was no problem. "I'm good at kissing, so it wasn't as challenging as it could have been!"