Which describes muscular endurance?

• A. Muscular endurance is the ability to sustain repeated contractions over time
• B. Maximum force produced in a single effort
• C. Range of motion at joints
• D. Heart's pumping efficiency during exercise

Answer: (A)

Muscular endurance is the ability to sustain repeated contractions over time. This explains why the description fits best: it focuses on how long a muscle or muscle group can continue working, not how much force it can produce in a single effort. The ability to keep performing actions or maintaining a submaximal effort without fatiguing first is the essence of endurance.

In contrast, maximal force produced in a single effort describes muscular strength, not endurance. Range of motion at joints relates to flexibility or mobility, and heart’s pumping efficiency during exercise pertains to cardiorespiratory endurance rather than how long muscles can work repeatedly.