What does the term "muscle endurance" mean?

Muscle endurance refers to the capacity of a muscle or group of muscles to sustain repeated contractions against a resistance for an extended period. This quality is essential for activities that require prolonged physical effort, such as distance running, cycling, swimming, and activities that involve many repetitions with lighter weights.

Option B accurately describes muscle endurance as it emphasizes the ability to perform continuous or repeated contractions over time, which is crucial for athletes engaged in endurance sports or activities that require sustained exertion. In contrast, the other options focus on different attributes: lifting heavy weights quickly relates to strength and power, maximizing strength output concerns maximal strength capabilities, and long runs without rest touch on aerobic endurance but do not encompass the concept of repeated muscle contractions specifically.