Answer:
D. muscle endurance.
Explanation:
Muscular Endurance- the ability of the muscles to perform difficult physical tasks over a period of time without causing fatigue.
Specificity is the answer. Specificity is a principle that helps a person improve his or her abilities. Such as a runner wanting to improve his or her speed and cardiovascular endurance through running in a span of time.The t<span>raining must be matched to the needs of the sporting activity to improve fitness in the body parts the </span>sport<span> uses. </span>
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