Does swimming really burn that many calories?

According to the MFP database leisurely swimming burns 667 calories an hour, is this true?

That would explain why I lost so much weight last summer then gain it all back over the winter. I swim like a fish... I love to swim... I'm in the pool at least 2 hours a day a couple days per week... At least I was last year and I plan to be this year...

Are there any other workouts that burn this many calories an hour that are as easy as swimming? If not I need to find an indoor pool to use during the winter!

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