running is my way to relax, no matter the speed i chose. Either jogging or sprinting. 
I like to run too, since it helps build nice calves and it is great cardio.
between 632 BCE and 1171 BCE, while the first recorded Olympic Games took place in 776 BCE. Running has been described as the world's most accessible sport.
History.
It is thought that human running evolved at least four and a half million years ago out of the ability of the ape-like Australopithecus, an early ancestor of humans, to walk upright on two legs.
Early humans most likely developed into endurance runners from the practice of persistence hunting of animals, the activity of following and chasing until
using her sprinting speed to take the gold. She broke the world record with a time of 2:01.1 minutes. Commenting on her win, Packer said "Middle-distance running for women was still in its infancy and the 800 m had only been run in Rome four years earlier for the first time. I knew nothing about the event but being so naive was probably to my advantage; it meant I did not have any limitations in my head regarding what I should or could do. Ignorance proved to be bliss."