Soccer became a Professional sport when teams began paying players to play for their wandering teams in the early 1800's. (Also the reason why many Soccer Teams are called the Wanderers or Rovers) Many teams were a collection of players who were drawn from various areas areas to compete against other teams, and to attarct the best players, some teams started paying players to play for them. This made them a "professional" player.
Practicing the sport
Women's soccer become an Olympic sport in 1996.
Of course you can't exclude people from a sport!
Athletics is not a professional sport
A professional soccer player is someone who is payed a wage to pley the sport. Effectively someone who plays soccer for a living.
canoeing, seriously, it may be professional but it is not a sport.
To become a soccer player in India you must do a lot of practice.Practice can led you to become a professional footballer.
To become a professional soccer player, you have to be hired by a team willing to pay you a salary.
There is Baseball & Soccer
well Belgium has a professional basket ball team and a professional soccer team. from all the statistics, soccer would be there main sport because they have won more soccer titiles that any other sport and there are more people trying out for soccer teams that any other sport.
There is no professional street soccer league, as for, the sport is more of a pastime.
They play professional indoor soccer
football......what you Americans call soccer