What principle of fitness means that if you stop exercising your fitness level will decrease

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:

cheetos? that's the answer? ?

sex is when a male and female has intercourse (sexual)