How about this as a funny app to keep you motivated on your winter run? Zombies, Run! Immerse yourself into the story (while you listen to your normal music soundtrack) as you slide into the shoes of a post-apocalyptic scavenger, Runner5. As you run your music is interrupted by other survivors who congratulate you for finding supplies or to warn you of dangers ahead. When you hear that familiar moaning in your ears.. you know its time to run for your life.