<P> In baseball, the bullpen (or simply the pen) is the area where relief pitchers warm - up before entering a game . A team's roster of relief pitchers is also metonymically referred to as "the bullpen". These pitchers usually wait in the bullpen if they have not yet played in a game, rather than in the dugout with the rest of the team . The starting pitcher also makes his final pregame warm - up throws in the bullpen . Managers can call coaches in the bullpen on an in - house telephone from the dugout to tell a certain pitcher to begin his warm - up tosses . </P> <P> Each team generally has its own bullpen consisting of two pitching rubbers and plates at regulation distance from each other . In most Major League Baseball parks, the bullpens are situated out - of - play behind the outfield fence . There are currently three MLB parks with bullpens in playable foul territory: AT&T Park, Oakland Coliseum and Tropicana Field . </P>

Where do pitchers warm up during a game