21.285 km in one hour. That’s what legendary Ethiopian distance ace Haile Gebrselassie managed at the Ostrava Golden Spike meet today. Full details here
This is roughly equivalent to an average velocity of 4:32 per mile, 13.23 MPH, 5.91 meters per second, or 354.8 meters per minute. I could add furlongs per fortnight if you’re really interested, but I’ll pass for now. Geb also broke the world 20k record en route.
Any way you slice it, that’s one hell of an effective and efficient aerobic system.