The correct answer is D; specificity
Further Explanation:
Specificity training principle is when a specific body part develops a skill. It also is when a skill is more developed by practicing that skill primality. One example is when a person wants to develop larger pectoral muscles. To develop the muscles, they must do only exercises that will benefit that body part.
A runner will not want to swim when perfecting that skill, they will want to start using a cardio exercise program to help. They will also need to burn more fat, this in turn will help them develop a longer endurance for running.
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