Cyclists love to brag about how many miles they have ridden. Beginner riders often track their mileage because it is easy to see it on a simple speedometer and track over time. Beginners often don’t venture far from their usual routes or seek out mountainous routes, so distance can provide motivation and some indication of progress.
If you’ve been riding consistently for some time, you will get better indications of your training progress by tracking the time you ride, the number of days you ride, and the quality of your intense days to see progress and catch disruptions or signs you need to adjust your training.