I've added support for the Wahoo Blue HR Bluetooth heart rate monitor to Run 5k, Run 10k, and Run Half Marathon. The apps should connect with any Wahoo Fitness Bluetooth LE sensor, but currently the only one that I know of is the Blue HR. ANT+ sensors and ones from other companies are currently not supported, and that's mostly because I only have the Blue HR to test with. Run 5k and Run 10k updates are available on the App Store now, and Half Marathon should be updated soon.To use the Blue HR, you don't need to pair it in the Settings app. You just need to make sure you're wearing it, and that it's transmitting a signal. You can use the Wahoo Fitness app to verify that it works. Then when you start a workout in the Run apps, it should automatically connect with the sensor. If it gets a valid heart rate reading from the sensor, the app will show a number next to the heart icon in the bottom right of the screen in Run 5k and Run 10k.