Which of the following is a component of muscular capacity?

Muscular capacity refers to the ability of the muscles to perform work over a period of time and includes various components that contribute to this performance. Muscular endurance specifically measures how well a muscle or group of muscles can sustain repeated contractions or maintain a contraction over time. This endurance is crucial for activities that require prolonged effort, such as running, cycling, or even completing multiple repetitions of strength training exercises.

In this context, muscular endurance is directly linked to muscular capacity since it influences how effectively one can perform tasks that involve sustained muscle use. Therefore, it is recognized as a fundamental element within the broader category of muscular fitness.

Cardio endurance, while important for overall fitness, pertains more to the efficiency of the cardiovascular system during prolonged exercise rather than muscular capacity. Body composition deals with the ratio of fat to lean mass in the body, and flexibility refers to the range of motion in joints, neither of which directly address the muscles' ability to perform tasks over time.