Zombies, Run! The living dead are pretty in right now, and what better way to motivate yourself than an augmented reality gamified running app where the goal is to outrun hordes of zombies and accomplish side missions? Just bring your imagination along, and run for your life!

Nike+ Running With this app you can map your running routes, keep track of your progress, and more. There's even a unique social feature that simulates a crowd cheering whenever your friends like your running posts. This really is the ultimate app for running, but requires iOS 4.0 or later.

Strava Run My favorite feature for this free app is that you can compare your progress and milestones against your friends, making exercise more competitive. You can even see how you match up against PRO runners!

Run with Map My Run - GPS Running, Jog, Walk, Workout Tracking and Calorie Counter There's a reason iMapMyRun is one of the highest rated running apps in the App Store. It has so many features for FREE, like Elevation, Calories burned, and optional stuff like Heart Rate stats and the ability to brag on Facebook and Twitter.

Couch-to-5K This app was made for people just starting out who strive for gradual improvement. It's like having a running coach in the palm of your hand.