I wonder how kickboxing fairs, done properly it is mentally taxing and one of the highest calorie burning exercises out there (up to 500 calories/30 minutes as

I wonder how kickboxing fairs, done properly it is mentally taxing and one of the highest calorie burning exercises out there (up to 500 calories/30 minutes as measured by HR strap). The mentally taxing part comes from the complex weight shifting and footwork that is constantly needed, complex combos require sophisticated manipulations of body weight positioning and constant shifting of stances and physical location around the bag. It is the only cardio-like activity I can stand, except it is way above the cardio zone, HR when active is above 150 (or even 160) and stays there for an entire 3 minute round.