What is defined as the ability of muscles to endure physical work for extended periods of time without undue fatigue?

Muscular endurance refers specifically to the capacity of muscles to perform repeated contractions over time, or to maintain a contraction for an extended period without experiencing excessive fatigue. This ability is crucial for activities that require sustained physical effort, such as running long distances, cycling, or engaging in prolonged sports activities. Developing muscular endurance helps improve overall stamina and efficiency in physical tasks, making it an essential component of fitness training.

In contrast, muscular strength pertains to the maximum force that a muscle can exert in a single effort, while muscular power combines strength and speed for explosive movements. Muscular flexibility relates to the range of motion in joints and muscles, distinct from the endurance that allows for repeated efforts over time. Therefore, muscular endurance is the most fitting choice for describing the ability to withstand physical work for longer durations.