I have to put different types of riding into my log often. Basically I always try to time how long I'm actually on, and then estimate how many total hours of work I'm doing. I never put in "riding - general" because I have NO idea what that is supposed to mean..
Usually I enter about 30 minutes of "saddling horse, grooming horse" and then 20 minutes of "horse back riding - walking" and 40 minutes of "horse back riding - trotting".
If it's pleasure riding I cut the calories (time) in half, because that barely takes any effort. I read somewhere that an inexperienced rider burns LOTS of calories just sitting on a horse and walking-- however, if you have an experienced seat then you hardly burn anything at all. If I'm jumping I add something like 15% effort.
I think it all comes down to how you personally want to estimate it. ^^
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