Originally Posted by
12strings
Initially, it was to improve overall cycling fitness. I have aspirations to try cyclocross racing in the fall.
They have worked well for me. Perhaps I will reach a point at which they lose their benefit, but I feel like I'm not close to that level yet.
At this point any and all riding will improve cycling fitness.
If it's a workout you enjoy, then why not.
I'd work towards trying longer stuff in the near future.