Going for a 30-minute run at a moderate pace of 10 minutes per mile (six mph) burns about 270 calories [1]. What if you only have 20 minutes and you still want to burn the same amount? Below are some ways to do it.

• Pick up the pace: Increase your speed and run much faster at a pace of seven minutes per mile (8.5 mph). You'll burn 261 calories after 20 minutes.
• Add a little incline: If you're on the treadmill, add a five percent incline and run at a pace of nine minutes per mile (6.6 mph) and burn 280 calories.
• Add a steeper incline: Go even steeper with a 10 percent incline and go at a pace of 10 minutes per mile (six mph) and burn 280 calories.
• Add sprinting hill intervals Alternate between running one minute with zero percent incline at a pace of nine minutes per mile (6.6 mph) and one minute with a five percent incline at a pace of eight minutes per mile (7.5 mph) and burn a total of 282 calories.

*All calculations are based on a 130-pound woman.