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Why Do Teams Keep a Reliever Warming Up for So Long?

Being ready too early is usually better than being ready too late.

Teams often keep relievers warming up because game situations can change quickly. Managers want a pitcher physically prepared to enter immediately if the starter struggles or a critical matchup appears.

A reliever cannot simply step onto the mound without preparation. The arm, shoulder, and lower body need time to reach game intensity safely.

Managers frequently ask relievers to stay loose because innings can become unpredictable. A starter may suddenly allow multiple baserunners, an injury might occur, or a dangerous part of the batting order could be approaching.

Bullpen management is closely connected to matchup strategy. A manager may not know exactly when a reliever will enter, but wants the option available. That flexibility often outweighs the inconvenience of an extended warm-up.

There is a downside. Repeatedly warming up without entering the game can create fatigue over time. Teams therefore monitor bullpen workloads carefully, especially during long stretches of games.

Why do teams keep a reliever warming up for so long?

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