Activity is the number of minutes that you have been active throughout the day. Basically, it's the overall duration of your exercise in 24 hours, and that can include anything -  from a cardio or yoga class at the gym to fast walking. 

Each vendor has their way of identifying that time and calculating it.
For example, on Apple Health Activity Time corresponds to Exercise Time:


Whereas on Misfit it is also called Activity


If you want to learn more about how your device or app calculates Activity, please visit your the website of your vendor.

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