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Free substitution or rolling substitution is a rule in some sports that allows players to enter and leave the game for other players many times during the course of a game, generally during a time-out or other break in live play; and for coaches to bring in and take out players an unlimited number of times.
Sports medicine is a branch of medicine that deals with physical fitness and the treatment and prevention of injuries related to sports and exercise. Although most sports teams have employed team physicians for many years, it is only since the late 20th century that sports medicine emerged as a distinct field of health care.
A player doing a keepie-uppie Association football (more commonly known as football or soccer) was first codified in 1863 in England, although games that involved the kicking of a ball were evident considerably earlier. A large number of football-related terms have since emerged to describe various aspects of the sport and its culture. The evolution of the sport has been mirrored by changes in ...
The substitution of absent players happened as early as the 1850s, for example from Eton College where the term emergencies is used. [5] Numerous references to players acting as a "substitute" occur in matches in the mid-1860s [6] where it is not indicated whether these were replacements of absent players or of players injured during the match.
Substitution (law), the replacement of a judge; Substitution (sport), where a sports team is able to change one player for another during a match; Substitution therapy or opiate replacement therapy; Import substitution industrialization, a trade and economic policy; Penal substitution, a theory of the atonement within Christian theology
A major change in the governing rules of the sport was made ahead of the 1941 college football season. Instead of removed players being lost for the quarter, a new unlimited substitution rule was implemented, providing simply, "A player may be substituted for another at any time, but such player may not be withdrawn from, nor the outgoing ...
The two-platoon system is a tactic in American football enabled by rules allowing unlimited substitution adopted during the 1940s. The "two platoons", offense and defense, are an integral part of the game today.
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