I guesstimate it. Basically, when you choose an activity, you also have to choose an intensity. I usually think about the course, how much climbing there was versus flat, and try to be honest about my level of effort.
If I do a 2 hour ride that involved a half hour of climbing, I'll probably put down the half hour of climbing at high intensity, an hour of moderate, and the last half hour (which involves the descending portion) at low. Seems to work for me.




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