How is muscular endurance defined?

Muscular endurance is defined as the ability of a muscle group to perform repeated contractions over an extended period. This means that rather than focusing on lifting heavy weights once or exerting maximum force, muscular endurance emphasizes the capacity to sustain activity for a longer duration using moderate levels of resistance or body weight.

Training for muscular endurance typically involves exercises that target a specific muscle group with lighter loads and higher repetitions, which enhances the muscle's ability to continue functioning without fatigue over time. This characteristic is crucial for many athletic performances and daily activities, where maintaining effort over time is necessary.

As for the other definitions provided, while some touch on aspects of muscular strength or recovery, they do not align with the core concept of muscular endurance. The correct understanding of muscular endurance is critical for designing effective fitness programs that aim to improve overall performance and work capacity over time.