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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.
In both rugby union and rugby league, a blood replacement (also referred to as a blood substitution or blood bin) is a special kind of substitution which can be used in the case of a player having to leave the field of play temporarily to have a wound attended to.
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
The assistant referee indicating a substitution Fourth official notifying the referee of the details of the substitution. Substitutions are governed under Law 3 of the Laws of the Game in the (3) Substitution Procedure section. [21] A player can only be substituted during a stoppage in play and with the permission of the referee. The player to ...
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 platoon system in baseball or American football is a method for substituting players in groups (platoons), to keep complementary players together during playing time.. In baseball, it is usually used to optimize batting performance against pitchers of opposite handedness.
None of the Christmas foods on the above list meet that definition—not even the Christmas pudding (i.e. a dried fruit-filled dessert) featured in A Christmas Carol. Bah humbug!
A rule allowing unlimited substitution was initiated, with players now permitted to rest and return as many times as they wished per quarter. The limited pool of talented players was thus better conserved. This rules change had the corollary effect of opening the game to offensive and defensive specialization — the so-called "two-platoon" system.