Q:

# Do frowning and smiling burn calories?

A:

Both frowning and smiling burn calories. However, they each only burn a tiny fraction of a calorie in every instance. Both frowning and smiling require muscle movement, and any muscle movement requires the use of caloric energy.

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It is impossible to know the exact amount of calories burned with these activities, but one study has found that laughing burns roughly 50 calories per 10 to 15 minutes, or about 5 calories to a little over 1 minute of laughter. Since the typical smile lasts only a few seconds and engages the same (but fewer) muscles than laughter, it is safe to presume that each smile burns only a small fraction of a calorie.

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## Related Questions

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According to The New York Times, stair climbing burns 5 calories per minute for a 120-pound person, 7 calories per minute for a 150-pound person and 9 calories per minute for a 180-pound person. The total amount of calories burned depends on the duration and intensity of the exercise.

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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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An average 150-pound person burns approximately 0.20 calories per regular sit-up. According to FitClick, an average person burns 6 calories per minute of regular sit-ups, and Top End Sports says the average reasonably fit person can complete roughly 30 sit-ups per minute.