What is the definition of muscular endurance?

Muscular endurance refers to the ability of muscle groups to sustain repeated contractions or continue performing a specific movement over an extended period without fatigue. This definition emphasizes the capacity to maintain activity and resist fatigue rather than the amount of weight lifted or the maximum strength of the muscles.

When considering this, it is clear that the correct definition encompasses the performance aspect of muscles in a variety of activities. Whether it's through high repetitions in strength training, long-distance running, or cycling, muscular endurance is concerned with how long a muscle can continue to work effectively.

In contrast, the other choices inaccurately represent muscular endurance. Lifting heavy weights signifies maximum strength rather than endurance, while holding a static position pertains more to muscular strength and stability. The maximum weight a muscle can handle is also related to strength rather than endurance. Thus, the focus on sustained contractions in the correct definition captures the essence of muscular endurance accurately.