Calories and Intensity

The American Heart Association chart shows how intensity varies the number of calories burned. A 100 pound individual running at 5 mph burns 440 calories in an hour. Upping the pace to 10 mph increases the calories used in an hour to 850. Twirling the rope faster helps you burn more calories during a workout. However, your ability to keep up the pace depends on your fitness level. A 100 pound person may not be as fit as a 200 pound athlete.