Even the official Zumba website admits that it's almost impossible to predict how many calories you burn per class. But given Zumba's constant, energetic movements, you can make a few educated guesses about the calorie burn.
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Zumba is a Latin-dance-inspired, fast-paced aerobic dance class. It involves your entire body, more than meeting the definition of cardio exercise: Anything that gets, and keeps, your large muscle groups moving rhythmically for an extended period of time.
Estimated Calorie Burn
You can burn between 360 and 532 calories in an hour of fast dancing, according to Harvard Health Publications. This makes the non-specific claims of "hundreds of calories per class," as published on the Zumba website, easy to believe.
Other factors that affect how many calories you burn in a Zumba class include how much you weigh, how much of that weight is muscle, and how hard you work out. In general, the heavier you are, the more muscle mass you have and the harder you work out, the more calories you'll burn.