I was riding for one of Cyrille Guimard’s teams (it was distinctly 80s). It was a start-of-the-year training camp. He got us all together and asked us what our fitness was like.
I said I could run 10k at 4:35min/km, and he looked disbelieving, but impressed. He then made me run around a 20m loop 500 times (and no-one was even timing me!).