My friend Rhonda told me about an app that helps people get more fit by running--with a twist. Instead of using a boring treadmill, the user puts on headphones and becomes part of a story. Take five steps out your door and suddenly you hear a noise. You hear a whoosh and discover that a zombie is chasing you, and you must run to save the world. Zombie lovers, story lovers, fitness lovers--this one's for you. Go here for more.