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Walking at a pace of 3.5 miles per hour usually burns between 314 and 469 calories an hour. The exact amount depends on the weight of the person and the terrain covered.

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High-intensity aerobic activity burns the most calories, compared to low-impact exercises. Two of the highest, calorie-burning, aerobic activities are jumping rope and running at a speed of 8 miles per hour. These aerobic activities burn 861 to 1286 calories per hour for a 160 to 240 pound individua

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How long it takes to burn 100 calories depends on the type of activity. Every activity, from breathing to step aerobics, burns calories. Everyday chores, such as sweeping and mopping, burn 100 calories in about 20 minutes of constant activity.

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A person can burn 100 calories by doing typical household chores and activities around the house. Basically, almost any activity that gets the heart racing and a person up moving around at a moderate pace burns around 100 calories, notes Woman's Day.

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On average a person who weighs around 180 pounds burns in the region of 100 calories per mile walked. A person who weighs closer to 120 pounds burns nearer 65 calories per mile.

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According to Runners World, the basic formula for determining total calories burned per mile while running is the runner's weight in pounds multiplied by 75 percent. The formula for determining total calories burned per mile while walking is the runner's weight in pounds multiplied by 50 percent.

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The formula to determine the total number of calories burned by mile is 0.75 times the runner's weight in pounds, so a 150-pound runner would typically burn 112.5 calories per mile. The speed at which the runner runs is also a factor.

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The amount of calories burned while watching television for one hour depends on several factors including weight according to Harvard University. While a person who weighs 125 pounds can burn 23 calories an hour, someone who weighs 185 pounds burns 33 calories an hour on average while watching telev

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According to SheKnows, a person at about 150 pounds will burn over 400 calories every hour swimming at a moderate pace. It is about the same amount of calories a person would burn during an hour long brisk walk.

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The number of calories burned while walking depends on the weight of the person and the distance traversed. According to About.com's medical review board, the average energy expenditure per mile of walking is 100 calories per mile for a 180-pound person and 65 calories for a 120-pound person.