Muscular endurance is defined as:

Muscular endurance refers to the capacity of muscles to sustain prolonged activity over an extended period without fatigue. This is essential in various physical activities and sports where repetitive muscle contractions are necessary, such as distance running, cycling, or swimming.

When muscles possess high endurance, they can perform repeated movements or maintain a certain level of exertion for longer durations, which is crucial in endurance sports and activities. This definition highlights the importance of sustained effort, rather than maximum force, speed of recovery, or overall strength of the muscles.

Maximum force capability relates more to muscular strength, while recovery speed pertains to how quickly muscles can repair and recharge after exertion, and those do not capture the essence of endurance as defined in this context. Therefore, the choice about the ability of muscles to work for an extended time is the most accurate description of muscular endurance.