I personally love to run outdoor fitness trails. I love the meditative value I get when out alone challenging myself to run faster and higher.
We talk a lot on 'Biggest Loser' about how fitness is a natural antidepressant how it burns off stress. What I like about running is that it gives me time alone. I'm always busy with people at work with my kids. I love getting out for a run by myself and just listening to my music.