Professional athletes have one trait in common – they are all very athletic and their skills are among the top several hundred in the world in their particular sport. For example, in Major League Baseball, there are 30 teams with 25 players each, making those ball players the top 750 in the world.
Dig a little deeper and in each sport there is an even smaller subset of players who are all-stars. Among the top 750 baseball players in the world, just 34, or just a little shy of 5% of that group are named to the all-star team each year.