An alumnus of JJ Abrams' (Alias, Lost) college-aged drama Felicity, Foley considers his role as a sharpshooter ranger his most physically demanding yet. "We shoot this in California, and in the summer it's 110 degrees," Foley tells MF. "I'm in full fatigues, goggles, hat, gloves, everything, and sometimes you have to play it like it's Siberia, even though you're burning up. Carrying gear, and running up and down hills—it's always physically challenging."

Did you get fit specifically to play a Special Forces agent?

Yes, I did. A guy named Gunnar Peterson is my fitness guru. I've been using the Ranger handbook. We've been running the gamut of exercises that rangers have to go through. I can now run two miles in under 13 minutes. We've also been doing these exercises swinging kettle bells, which develops my core and upper back and shoulder regions, and improves the V-shape definition that rangers have: the smaller waist and larger shoulders.

How do you find the time to work out?

It's really, really hard. I find myself up at 4:30 in morning before a 7 a.m. call. If I can, I spend half an hour before lunch on a treadmill or a big incline just to burn calories to stay in shape.

What are you eating?

Craft services are a nightmare for me. I am a big fan of plain roasted almonds. It's always a good snack and it will curb your appetite. In the morning I usually do a protein shake. I've taken banana with some ice water and egg whites, protein powder, and blended it. For lunch or dinner I have a piece of protein with salad greens, and the combination really keeps me as lean and I need to be. The older I get the harder that becomes.

What TV shows are you watching?

I find myself watching a lot of Discovery Channel. Between Deadliest Catch and Dirty Jobs, I am the happiest guy in the world.

What's next?

More of The Unit, we do 23 episodes a season. I just got married on my hiatus so I didn't do any other projects.

Is it that tough to watch old episodes of Felicity?

You know what, I do watch it? And I look back without judging. If I were to pick it apart I'd hate myself. I enjoy it for the memories I had and the show that it was, it spoke to a people of a certain generation.