Fitbit charge 3- setting for HIIT class

[Rathkelter]

If anyone out there does circuits or HIIT what do you put your fitbit on? Running? Weights? Or just leave it in normal step mode? I want to make sure it's logging accurate calorie burn.

I have one that just says "workout" so use that for most classes

I just leave mine in normal mode, it logs as an aerobic workout.