Trained humans can maintain a speed of ~20kph for hours
The very best humans can only manage ~20kph for 2.05 hours (WR: 42.2km in 2:02:57 giving 20.59kph). Beyond that, the 50km WR is down to 18.3kph; 100km WR is 16.1kph; etc.
Endurance runners are not generally strong. Upper body strength for example is counter productive.
Further, Olympic paces are maintained by people getting aided with sports drinks at regular intervals etc. It's very different from the conditions primitive people would have lived.
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The very best humans can only manage ~20kph for 2.05 hours (WR: 42.2km in 2:02:57 giving 20.59kph). Beyond that, the 50km WR is down to 18.3kph; 100km WR is 16.1kph; etc.
That's for modern humans. Bone density studies of humans ~10,000 years ago suggest our muscles were much stronger.
Endurance runners are not generally strong. Upper body strength for example is counter productive.
Further, Olympic paces are maintained by people getting aided with sports drinks at regular intervals etc. It's very different from the conditions primitive people would have lived.