The corollary of the _____ principle is the principle of reversibility.

• A. Overload
• B. Specificity
• C. Reversibility
• D. Progression

Answer: (C)

Maintaining a training effect hinges on keeping the stimulus ongoing. The reversibility principle captures what happens when that stimulus is removed or reduced: the adaptations gained from training decline. So the corollary is that without continued training, improvements are not permanent and will fade over time. This is why ongoing—or at least consistent—training is needed to preserve gains.

The other principles describe how to apply training (increasing demands, focusing on the type of work you do, and progressive loading), but they don’t describe what happens when the stimulus stops in the same direct way.