The fastest calorie burning exercise?

When I was watching TV today, a program is talking about winter swimming. It just lasted for a few seconds after I switched to the channel, I didn’t get much information. But I got a good news. It said that a ten minute’s winter swimming will burn more calories than 1 hour general cardio. If this is real, winter swimming may be one of the fastest calorie burning exercises.
But, how many people can bear that cold water in winter?
Swim in winter to lose weight? I won’t do that, lol, it is too cold.

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