It is known that American Indians played a game similar to basketball. However, the modern origins of professional basketball can be traced to Dr. James Naismith, a physical education teacher in the United States who conceived the sport in 1891. It was first played at Springfield College in Springfield, Massachusetts, USA. Dr. Naismith sought to create an indoor game to keep his students fit and prevent them from getting injured at the same time. After establishing itself as a new game in a short period of time, basketball began to attract the interest of wider audiences. Although basketball first began to be played in the United States in the late 19th century, it spread to Canada, France, Britain and also became popular in other countries across the world. Men's Basketball was first included at the Berlin 1936 Summer Olympics. Today, it is considered as the second most popular sport in the world after soccer. Basketball is the second most popular sport after soccer in Turkey, too. Basketball is a team sport in which two teams of five players try to score points by throwing a ball through the top of a basketball hoop, which must be 3.05 meters from the floor. Basketball is primarily an indoor sport. The basketball court consists of a hard rectangular wooden surface. An ideal basketball court is 28 meters long and 15 meters wide. It is divided into two equal halves by a line called "center line." There is an area called the "center circle" right at the middle of the center line. There are two backboards at either end of the basketball court facing each other. Basketball is played with the hands and teams score points by throwing the ball through the opponents’ basket. In addition to its importance as a game which contributes to the physical and mental development of children and adolescents in particular, basketball also has positive effects upon the social development of children due to the fact that it is a team sport.