The “two fast runners” in the story are an antelope and a deer. As the story goes, the two met on the prairie and argued over which was the faster. They raced in the open spaces of the grasslands, and the antelope won. The deer, believing the antelope had an unfair advantage in the open space, challenged the antelope to a race through the woods. In the woods, the deer won.
The lesson is a simple one. You’ll be more likely to find success in your element, in familiar places and environments you know best.
* Gutenberg Project 13833-h.txt or 13833-h.zip, George Bird Grinnell, Blackfeet Indian Stories, 1915. https://ia902700.us.archive.org/20/items/blackfeetindians13833gut/13833-h/13833-h.htm