Martial arts isn't usually considered a traditional aerobic exercise, but it gained some traction during the Tae Bo craze in the 90's. More recently national chains such as 24 Hour Fitness and Ballys have offered cardio kickboxing classes.
If you don't believe that martial arts can deliver cardio results, check out this video. Forget the acrobatics, which are obviously super advanced. You need to be in serious shape just to work out at this pace.
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