If you’re a runner, chances are that you use RunKeeper. Even with the Nike+ app in the space, RunKeeper has continued to set the pace (no pun intended) for runners worldwide. The latest update adds some great features that you’re sure to love:

Heart Rate Monitoring

Want real-time heart rate information? Of course you do. Now RunKeeper supports the Wahoo heart rate monitor for the iPhone and the Polar WearLink+ transmitter with Bluetooth for Android.

Selective Sharing

Want to share your activity or maps, but only to certain people? Now you can. Selective sharing will let you choose partners and share your activity or maps as you see fit.

All The Rest

Two-way sync will let you keep things in line with your RunKeeper.com history and you can update activity from either the app or the website. There are more audio cues for the iPhone version, and Android will have them soon. Finally, you can manually update your activity into the app.

Full details are available on the RunKeeper blog, and keep in mind that the app is free through the end of January to help you kick off that weight loss resolution.