Yet if you were to start walking today, and kept walking every day, in 6 months you'll be able to jog half a mile, or a kilometer. There are literally humans out there that have gone from 600+ lbs, or about 275 Kg, to running and completing their first marathon in just over 18 months. That's dangerously fast by the way.

Your body wants to move and stretch that's why stretching feels so good. Master Sin Thé taught his Shaolin classes that if you get a good workout going as a youth, and you keep making it harder so you keep growing, that will keep you young and in shape till you are around 80, and will slow the decline of age after it finally starts.

Our endurance isn't just for running. We are also one of the longest lived species on the planet, and we are about to use medical tech to become the longest living animals, I doubt we will be beating trees, sponges, and jellyfish for age any time soon

Edited to add: it's pronounced like Sin Tay

The humans running down animals for hours also feel like that after a bit fyi. They are just hungry enough to keep running.

I have some friends who are into serious long distance running and they are constantly in a state of suffering while running. It's the feeling of stopping running that makes them keep wanting to go running, not the feeling of the actual running.