The RunKeeper mobile running app lets you track your workout performance over time, while connecting with your friends to make your workouts social. Track your running, walking, cycling, hiking, biking and more using the GPS in your phone. With Runkeeper you can:

• See detailed stats around your pace, distance, time and calories burned.
• Get stats, progress and coaching through your headphones with built-in audio cues.
• Listen and control your music during your workout.
• Measure your heart rate with many available sensors (appropriate heart rate zones depend on your weight).
• Update your weight to keep calories burned accurate.

Runkeeper also allows you to measure your performance over time. You can view a detailed history of your activities (runs, walks, bikes, etc.) to see how you are doing, get notified when you hit new personal bests and milestones, measure your progress against your goals and targets and follow detailed plans to help you achieve specific fitness objectives, like running for weight loss or running a 5K. You can also share your progress with friends via Facebook and Twitter.