I still can’t understand how people run 5ks

I’ve been outside again for four months now and can still barely do a mile. While I am improving, I ran nearly nonstop today without stopping for a drink, I still suck at distance and time though. Maybe it’s just because Im not genetically inclined to do this but I just don’t improve like others do.

Also fun fact ancient people were far better runners than us modern slobs. In old documents its recorded the roman army would with 12-20 kilometers a day as part of their training. Apparently its because people walked different before decent footwear was invented and that cause their legs to be much stronger naturally.