I'm a big fan of walking. I had to quit running because of my knees, so walking and hiking became my new exercise, when I lived in NYC, I would average 100 miles per week, when I moved up state, a lot less, but still 50-60 miles per week, and then I moved to back to Texas last week and now I feel like it will be closer to 20 miles a week if that. I live on a major road, there aren't many places to walk around me, so might end up in the Apartment gym on a treadmill staring at the wall for my morning, lunch, and dinner walks.