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I never heard of Kettlercise before so looked at some videos. Kettlercise doesn't look very demanding. Less heavy breathing than my 12 minute/mile pace jogs. There are very impressive claims about how much calories Kettlercise can burn, like 657 calories in 45 minutes (24yo F, 5'6", of unknown weight)
I tried using the calories burnt as function of HR formula* on this page:

Is it possible to measure calorie burn from heart rate alone?

That formula comes up with numbers I think are credible for my calorie burn when I am jogging (*I have a pretty good estimate of my real VO2MAX).

But the HR that would be required for a 24yo female to get to 657 cal/53 minutes, requires all kinds of extreme values in the formula above. VO2max = 50, 70 kg, avg HR = 195. Do those numbers make sense(??) Is the formula that inaccurate?

Or would I be right to think that Kettlercise energy expenditure is probably being over-hyped?

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    Kettlebell exercises are probably too complex of movements to fit into that formula. Plus there's some degree of anaerobic work going on with these types of movements. – Alex L Feb 8 '16 at 0:09
  • Do some snatches and swings with a 53lb kb, and then check that effort against a 12 minute mile. – Eric Feb 8 '16 at 7:25
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    How did you obtain the value for your "good estimate of your real VO2max"? – JohnP Feb 8 '16 at 19:58
  • Thanks for replies. .....It looks very boring, costs money, I have history of RSI in my forearms, so Kettlebells probably not good for me. I just wondered if those calorie expenditure values could be true for something that doesn't look that tiring..... I had my VO2MAX lab-tested 10 yrs ago. Assuming an avg % decline for my age, my VO2Max should still be around 44-I forget the units, but anyway, close enough. My husband had his VO2MAX done 10 yrs ago & again 3.5yrs ago (both lab -treadmill etc) and his hadn't changed at all in the intervening time. – Julii Brainard Feb 9 '16 at 9:49
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Exercises with kettlebells can be as hard as barbell work, sprinting or high end sport activities if done correctly.

'Kettlecise' sounds like a group class which is typically aimed at anybody. So it might not be suitable for someone already quite fit.

Try it out and then increase the weights as necessary. A 8kg kettlebell in a class feels a lot different to a 24kg one.

Much like a jog and a sprint are essentially the same but completely different.

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