The rockers known as the All-American Rejects are all about health, and they tell PEOPLE magazine it's not hard for the group to live healthfully.

"On the road we're just active every day," says rhythm guitarist Mike Kennerty. "We're playing shows. So that really does help. It's when we come off the road that we're not doing anything but sitting around drinking."

Drinking milk is what he means.

The quartet joins a slew of other celebrities donning milk mustaches in the famous Got Milk? ads. The ads, which promote the nutritional benefits of drinking cow's milk, are a bit controversial. Click here for more scoop.