Professional refers to somebody who earns a living by doing something, therefore only sponsored athletes are professional. The majority of athletes aren't professional.
There are more than 1,000 professional athletes in Europe.
Most, Michael Jordan for example.
There number of the professional black athletes is in the tens of thousands. Most of the athletes disciplines is dominated by the black athletes from different parts of the globe.
What kind of athletes
No, you have to be amateur I believe.
there are currently 102 million athletes in the world.
Many kids dream of being professional athletes.