Typically, an able-bodied person who can walk would be able to run.
However, if the same person was to compete professionally as a runner, he or she would need to know the right techniques and practice accordingly.
On the contrary, many people think that if a person can talk, then they can be a speaker or a trainer.
Training as a professional (one who earns a living out of the profession), requires a similar effort as a competitive runner.
Diet or nutrition (what you “consume”) and commitment plus discipline (what you “produce”) is also important. It is not only because you can run, therefore you can be a pro runner.
The good news is one can be taught and trained to be a professional trainer.