Treadmill - 10% incline @ 8 mph

This activity burns approximately 1,223 calories per hour

If you're interested in improving your fitness or perhaps running a 10K race faster, try bringing your running workout inside onto a treadmill. After leveling off at 8 mph, gradually increase the treadmill incline 2% every 5 minutes until you've reached 10%. Maintain both your running pace and the grade for at least 20 minutes.