Nike's most popular running app has just landed on the Google Play Store. Called Nike+, the app allows fitness buffs the ability to track and share their running records, while motivating the sluggish with in-run audio feedback. Best of all, the app is totally free.

The app has a number of unique features, including:

• See how your run compares to the last seven you took.
• Visualize all your runs side-by-side and see your progress in a bar graph.
• Find Nike+ Top Routes in your area by syncing your runs to Nikeplus.com
• Widget displays total mileage.
• In-run audio feedback cheers you on, tracks miles.
• Tag your map and share your running routes with friends and family
• Record how you felt, the terrain you tackled and the weather you experienced.

There are a lot of great fitness apps out there, including Endomondo Fitness Tracker and Zombies, Run, but Nike's app has an aesthetic polish that we appreciate.