The answer is “variation”.

The Variation Principle recommends that minor changes in preparing regimens yield more steady gains in game execution. Preparing programs for all intents and purposes each game incorporate varieties in force, term, volume, and other vital parts of training.  

The most outstanding technique for practice variability concerns preparing in stages. Commonly, a yearly games preparing program incorporates periods of preparing for molding, concentrated game particular work, in-season support, and an off-season regimen. Preparing in stages, or periods, is called periodization.