Surprising factors that may keep you thin

By Dr. Melina Jampolis, CNN

Updated 1618 GMT (0018 HKT) October 18, 2018

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Laughter is not only the best medicine, it is the most effortless way to burn calories. Chuckling through a 15-minute stand-up comedy routine can burn between 10 and 40 calories. And this feel-good activity releases a feel-good hormone called serotonin that could reduce appetite.<br />

Photos: 10 ways to burn calories without stepping foot in the gym

Good belly-slimming laugh – Laughter is not only the best medicine, it is the most effortless way to burn calories. Chuckling through a 15-minute stand-up comedy routine can burn between 10 and 40 calories. And this feel-good activity releases a feel-good hormone called serotonin that could reduce appetite.

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Whether you love the disco or can only tolerate an occasional slow dance at weddings, dancing has major weight loss potential. Jamming with friends at a party can burn between 450 and 600 calories, depending on how vigorously you get down. Even swaying at a concert for an hour can counter the effects of that small 230-calorie order of McDonald's French fries you might be tempted to eat on the way home.<br />

Photos: 10 ways to burn calories without stepping foot in the gym

Lose the belly dance – Whether you love the disco or can only tolerate an occasional slow dance at weddings, dancing has major weight loss potential. Jamming with friends at a party can burn between 450 and 600 calories, depending on how vigorously you get down. Even swaying at a concert for an hour can counter the effects of that small 230-calorie order of McDonald's French fries you might be tempted to eat on the way home.

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Sex is one of the best workouts outside the gym. For those who can make it last 30 minutes, intercourse can burn about 160 calories. The same amount of foreplay expends about 55 calories.

Photos: 10 ways to burn calories without stepping foot in the gym

Hot and less heavy – Sex is one of the best workouts outside the gym. For those who can make it last 30 minutes, intercourse can burn about 160 calories. The same amount of foreplay expends about 55 calories.

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When rifling through racks of clothes or bins of school supplies, know that an hour of shopping can burn about 180 calories. And if you go grocery shopping for that amount of time, all the heavy lifting can help you burn closer to 260 calories. Just make sure to avoid "shopping and eating at the same time," said Dr. Holly Lofton, director of the Weight Management Program at NYU's Langone Medical Center.<br />

Photos: 10 ways to burn calories without stepping foot in the gym

Shop till you drop the pounds – When rifling through racks of clothes or bins of school supplies, know that an hour of shopping can burn about 180 calories. And if you go grocery shopping for that amount of time, all the heavy lifting can help you burn closer to 260 calories. Just make sure to avoid "shopping and eating at the same time," said Dr. Holly Lofton, director of the Weight Management Program at NYU's Langone Medical Center.

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For overweight women and men, standing instead of sitting at the desk burns about two more calories a minute and can lead to a weight loss of 16 to 20 pounds a year, according to Mira Rasmussen, an exercise physiologist at the Obesity Action Coalition, an obesity advocacy group. You can also try pacing the office; a total of two hours a week can lead to a weight reduction of about 10 pounds a year, Rasmussen estimated.

Photos: 10 ways to burn calories without stepping foot in the gym

Work it off – For overweight women and men, standing instead of sitting at the desk burns about two more calories a minute and can lead to a weight loss of 16 to 20 pounds a year, according to Mira Rasmussen, an exercise physiologist at the Obesity Action Coalition, an obesity advocacy group. You can also try pacing the office; a total of two hours a week can lead to a weight reduction of about 10 pounds a year, Rasmussen estimated.

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Don't be shy about wailing along to your favorite tunes, at least in the privacy of your own home or car. Singing can burn about 136 calories. Bonus if you can also dance to your favorite tunes.<br /> <br />

Photos: 10 ways to burn calories without stepping foot in the gym

At the top of your lungs – Don't be shy about wailing along to your favorite tunes, at least in the privacy of your own home or car. Sing