Some might think Kate Upton's modeling work consists of a lot of posing still on beaches, but when she's showing support for Marine Week, she's put through a grueling workout.

According to the New York Post's Page Six, Kate is promoting a Marine Week celebration by partaking in military PT, including aerobics and running.

After her workout, Kate reportedly said "I knew it was going to be hard. The Marines are very tough."

Kate's partner, MLB pitcher Justin Verlander, shares her passion for the armed forces and founded the Wins for Warriors charity.

He tells Page Six, "I think it's easy to show your support with words. I think going out there and doing that workout really shows how much she supports the military."

The few, the proud, and a super model.