It is played with two teams of at most five, each with one goalie on a basketball court or soccer field (depending on variant).
[1] Elmer was a physical education professor, who sought to develop a game that was not restrictive to the rules of any one sport.
The sport was popularized and later reformed by players and coaches at Millburn High School in New Jersey.
The sport became so popular in the Millburn area that it became an official gym class elective any student could take.
Today, it is played in many American high school physical education classes.
The field players are permitted to touch the ball with any part of their body at any time EXCEPT their arms/hands (see next rule for details).
Unlike soccer, a single red card does not mean the player is kicked from the game.
The player receiving the card must sit in a penalty box and must stay out for at least five minutes.