I just bought an applewatch 4 and I want to use it for exercise. So I am scouring the online resources. However, the workout apps allow you to "set a goal" and "show a report".
What I want to use it for is to help me regulate my effort continuously so that I can burn the desired level of calories, run the desired distance or run for the desired length of time **while maintaining the ideal HR **.
I remember from gym class that you could get better conditioning training by actually relaxing the tempo so that the aerobic metabolism and respiration exchange was breaking even. For someone who is not in good shape, this would mean to slow down to a walk preemptively.
Was this a myth? Why isn't this a thing with all the smartwatches? Why do I have have to set a target HR? Shouldn't the workout apps figure this out by measuring my efforts?