Elite marathoners are incredibly fast. It boggles the mind. But, for me, I'm more impressed by Camille Herron breaking the world record (men's and women's) for 100 miles in 12 hours, 42 minutes, and 39 seconds which is a 7:38/mi pace.

Running a 7:38 mile would be really fast for most adults, but to do it over 100 miles is unthinkable.