(or you can define it this way...)
|to go quickly by moving the legs more rapidly than at a walk and in such a manner that for an instant in each step all or both feet are off the ground.|
|“Running to him was real; the way he did it the realest thing he knew. It was all joy and woe, hard as a diamond; it made him weary beyond comprehension. But it also made him free.”||~ John Parker, Once A Runner|
Once A Runner by John L. Parker Jr.
(The runner's Bible)