HRM for These Activities?

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Hello,

I know so many posts have been added about HRM and such but I've been seeing a lot of mixed responses. I understand they work for "steady state cardio" and would not display accurate results for, say, weight lifting. I wanted to ask how HRMs fare when it comes to a cardio-kickboxing class and also a conditioning boot camp class? There will be a few moments of rest but otherwise it's drill drill drill. Would I pause the HRM during the moments of rest or just leave it on all the way through? Or would it be completely useless?

Thanks

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