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D. Muscular endurance

Explanation:

There are two major components of physical fitness: the health-related components and the skill-rekated components of physical fitness.

Health-related components include characteristics that help one in healthy functioning and survival of the body, as it helps in ensuring a functional health of an individual. These components include: muscular endurance, flexibility, cardiovascular endurance, muscular strength, and body composition.

Skill-related components are characteristics that are majorly related with helping an individual to be more efficient sport activities efficiently. These helps in improving the performance of an individual, especially in activities and sports that involves technicalities.

They include: power, coordination, recatuon time, agility, speed, and balance.

✅Therefore muscular endurance is not a skill-related component. It is an health-related component.

which ever one is showing doing the same exercise in time intervals such as 30 seconds or a minute several times.