Any Dance Teachers Out There?

I have a full time desk job and teach 2 nights a week on the side. I was wondering if anyone else teaching dance logs their teaching in. I have my activity level set at sedentary because I do not teach that often. My two classes tonight are a trio, where I demonstrate and dance a lot and a class of 14 preschoolers that keep me moving the whole time. I have a HRM but it is only accurate when I am doing strict cardio...plus I think the stress of the preschoolers would probably cause my HR to get pretty high haha! I think I should log something but I don't want to over estimate. Thanks for any insight.