This is why this whole thread is just stupid. It ignores the things that distinguish an athlete being good at one thing and not another. All of the arguments that road marathoners could destroy Walmsley and Dawaulter assumes that their bodies have the physical requirements to hold up to this type of athletic pursuit and training. There is a difference between a linebacker and a QB on the football field in terms of what their bodies are capable of doing. Same goes for runners. Some runners are built for the flats and roads. I’m not an elite athlete but after training for trail races for a couple of years I learned my body isn’t built for it. I’m a flat runner. And I’m sure many road marathoners would find their body isn’t built to train to the degree necessary to throw down a 5:42 downhill mile after running over 100 miles (see Walmsley’s Strava data).