Wheelchair Rugby was developed in Canada during the 1970s by athletes with quadriplegia. It is an intense coed team sport for male and female athletes with quadriplegia (tetraplegia). The sport can be very physical as athletes attempt to carry the ball over the opponent’s goal line. Depending on functional abilities, athletes are placed into one of seven sport classes from 0.5 (most severely disabled) to 3.5 (most function). Two teams of at least four players each compete for four periods of eight minutes each. During play the total value of the four players allowed on the court from each team cannot exceed a total of eight points. Wheelchair Rugby is governed by the Ontario Wheelchair Sports Association.