Which one of the following may be due to illness, injury, and a lack of motivation?

• A. Athletes Decide Not To Go Into Detraining, Because It Would Just Be A Waste Of Time
• B. Athletes Begin To See Increases In Their Exercise Gains Due To The Reversibility Principle
• C. Athletes Decide That The Reversibility Principle Only Applies To People Over 50 Years Of Age
• D. Athletes Decide To Go Into Or Are Forced Into Detraining

Answer: (D)

Detraining happens when the training stimulus is reduced or stopped, so the body loses the adaptations it had built. Illness, injury, and a lack of motivation all lower how much athletes train, leading to detraining. This scenario fits because it describes going into or being forced into a period of reduced activity, which is exactly what detraining is.

The reversibility of training gains means those improvements aren’t permanent once training stops, but can be regained with resumed training. Other options don’t fit: choosing not to detraining implies continuing training despite illness or motivation issues, claiming gains increase due to reversibility is the opposite of what happens, and saying the reversibility principle only applies to people over 50 is incorrect.