Many runners who compete at the local level don’t follow any structured workout plan
This may be one of the more surprising things I found on Strava. I grew up as a competitive runner starting at age 14, and was immersed from day one in the debates about easy runs and long runs vs. interval work vs. tempo and threshold runs vs. VO2max work, or whether to follow an overall plan of higher-mileage/lower-intensity vs. lower-mileage/higher-intensity, and so forth.
No matter where you stood on these issues, if you knew anything at all, you followed a training program that incorporated at least some kind of planned approach. Even if you didn’t or couldn’t follow the plan consistently, or “went by feel” when deciding whether it might be better on any given day to substitute a different type of workout for what you might have originally planned, you usually tried to get in a certain number of faster miles vs. slower miles, a certain amount of tempo or interval work, and so forth. It might have been more of a loose plan or template rather than a set or scheduled one, but when you looked at examples of training programs, the details tended to reflect one approach or another.
What has surprised me on Strava (well, somewhat) is how little rhyme or reason there is to most runners’ approaches to training, at least if you assume the majority of runners on Strava are more competitive types. It isn’t clear to me whether many just run entirely by feel, whatever that’s supposed to mean in terms of what types of workouts might be performed when, or if they truly don’t have much conception of how or why they might want to structure their training in a certain way in the first place.