We didn't invent bows and arrows or even throwing spears until relatively recently. This means we spent hundreds of thousands of years chasing animals around trying to stab them. How the hell did we succeed? All the animals worth eating are much faster than us. Persistence hunting can't account for it as that only works in very hot or snowy conditions.
Clearly there is an undiscovered missing link, an animal that was slightly slower than us which we hunted to extinction. Once it was gone, we had to invent bows, atlatls, domestic dogs and such to survive.
I don't know what this animal was, but the average one probably ran about 15, 65, 4:50 and 2:45. If it were faster, most adult males of hunting age could beat those times, instead of a tiny minority.