08/11/2011 AT 5:40 PM ET
If you want a workout to be a little more fun and a little less work, it’s nice to have a friend.
“I really hike, and I usually bring my dog,” Duff says. “I live in a place that is crazy traffic all day, every day, and to be able to come into the mountain, hike and see other people – I really love that. I find that when I’m working out, I live a healthy lifestyle.”