People Magazine caught up with Shia LaBeouf, who was promoting his latest film Disturbia. The actor was asked a few questions about his role in Indiana Jones 4.

Here is what the magazine wrote:

Shia LaBeouf has gained 15 pounds - and he's happy about it. The Disturbia actor is beefing up to star in the new Indiana Jones movie alongside Harrison Ford. "The guy is still in premium shape," LaBeouf tells PEOPLE. "You don't want to be standing next to Harrison Ford and not be jacked also."

To get there, the Los Angeles native, 20, is working out seven days a week for three hours a day. "I'll run for an hour and then I'll do two hours of weights," he says. "I have definitely not trained like this for anything in my life. I'm preparing like I'm going into battle."

RELATED: Harrison Ford on the Future of Indiana Jones: When I'm Gone, He's Gone

He's also on a "protein-heavy, carb-heavy" diet. "I drink protein shakes nonstop - three or four a day - and I run a lot, so you get rid of the bad carbs and keep the rest so you have the energy to make it through," he says.

CLICK HERE to read the entire interview with Shia LaBeouf!