Originally Posted by
Bob Ross
I log miles because I want to know how far I've gone...partially to compare to previous years, partially as a sense of accomplishment, partially because Going Places and Getting Out Of The House is one of the inate joys of cycling for me, and of course partially for bragging rights in BikeForum's end-of-year Annual Pissing Contest... but mostly so I can keep tabs on bike maintenance & consumables. I like data that supports "yowza, I rode over 800 miles last month, I'd better check my tires and chain!" since it's a handy reminder.
No one is suggesting you don't log your time on Zwift. Or, even better, log your watts-per-hour if "effort" (aka "work") is what you're trying to measure.
But "Miles" are a measure of distance, not "effort".
My beef with the whole Should I Log My Trainer Miles [sic]? question is purely semantic; that's the wrong word to describe what you are doing.
You mean Watt hours, not Watts per hour. Yeah you could measure that, like nobody else does.
Things I routinely measure on Zwift:-
Virtual mileage
Virtual elevation gain
Average Power
Normalised Power
Elapsed Time
Moving Time
Basically all the same metrics I use on a road ride. What would be the point in using different metrics in training?