Track Runner is one of the best running apps for Windows Phone, and it keeps getting better. The app picked up a huge version 3.0 update in early June that added adaptive interval training, a pacer, an improved user interface and support for Windows Phone 8.1. Fast forward to today and we're now looking at version 4.0 in the Windows Phone Store. Let's check it out this killer update that adds Bluetooth 4.0 heart rate monitor support and more.

Navigate yourself to the Windows Phone Store, and you'll find yourself looking at version 4.0.1.2 of Track Runner. Here's what we get today:

Today's killer update makes Track Runner even better. A handful of you already have Lumia Cyan, but the majority are still waiting for Cyan. Add Track Runner as a reason to want the update sooner rather than later.

Track Runner version 4 will be very welcomed by those with a Bluetooth 4.0 heart rate monitor, Windows Phone 8.1 and Lumia Cyan. You'll need Lumia Cyan and Windows Phone 8.1 to get the heart rate monitor talking to the app. But if you fall into this category you get to track your heart rate when you're out for a run. Handy for training and general activity tracking.

SensorCore folk are going to like the cadence analysis and auto-pause/auto-resume features.

Runners can mimize risk by adopting a higher stride rate (steps taken per minute). You'll get less stress on your knees and ankle joints by having a higher stride rate. Track Runner uses the SensorCore API to analyze your cadence and make sure you're hitting the stride rate you want.

Come to a busy intersection while running? The SensorCore technology in devices like the Lumia 635 will automatically pause and resume your tracking within Track Runner. Really cool use of the tech and we're glad to see developers taking advantage of it.

We'll have more with Track Runner v4 in the near future, but for now take it for a run and let us know what you think! Have a Lumia 635? Then you're going to enjoy the new features.