1. Training or instruction that is outdated, no longer relevant, or has lost its effectiveness due to age or lack of updates
The company's stale training materials haven't been updated in five years.
Os materiais de treinamento obsoletos da empresa não foram atualizados em cinco anos.
2. In sports or fitness, repetitive training routines that no longer produce improvement or adaptation
Athletes often hit a plateau when relying on stale training methods.
Os atletas frequentemente atingem um platô ao depender de métodos de treinamento desgastados.