What do you burn in spin class?

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Anyone in the 130s and take spin? I always feel like I am working my *kitten*$ off, I sweat like crazy, but my calorie burn tends to be lower than what it would be during a run, which for me is a lot easier.

55 minute spin class yesterday where I pushed myself to the max: 384 calories.
55 minute run outside averages about 500 calories for me.

Just curious as the numbers up on the screen in my class are often for men and people who are varying sizes--often their burn is double mine. :-(