I frequently did a 60 minute online Barre class during my pregnancy and recorded 170 calories for the hour. There was an article in some women's fitness magazine where they got 3 women to wear monitors during different exercise classes to estimate their "actual" calorie burned versus what was stated by the class. For Barre, depending on the effort put forth by the woman in the class (each woman did a few classes to get a range), the burn ranged from 164-323 calories for a 60 minute class for a woman who weighed 150 lbs. I'm 115 lbs, and I log 400 calories for a 55 minute high intensity run covering 7.5 miles (12 km). So there was no way I was logging an amount close to that for a Barre class.