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Answer:

The Use or Lose Principle

The Principle of Use or Lose implies that when it comes to fitness, you "use it or lose it." This simply means that your muscles build strength (hypertrophy) with use and lose strength (atrophy) with lack of use. This also explains why we or lose fitness when we stop exercising.

Explanation:

Answer: Losing fitness, Losing fitness is the stage you stop working out and start to loose your gains.

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