Which statement defines muscular endurance?

• A. The range of motion of your joints, or the ability of your joints to move freely; mobility of muscles.
• B. The ability to carry out work against resistance; maximal force you can apply against a weight.
• C. The ability of the heart, blood cells, and lungs to supply oxygen to muscles.
• D. How able a muscle or muscle group is to undergo repeated contractions without fatigue.

Answer: (D)

Muscular endurance is the ability of a muscle or muscle group to perform repeated contractions or sustain a contraction over time without becoming fatigued. This focus on how long a muscle can work rather than how much force it can produce or how well oxygen is delivered distinguishes it from other fitness components. The statement describing a muscle’s capacity to undergo repeated contractions without fatigue captures this idea. By contrast, range of motion relates to flexibility, maximal force defines muscular strength, and the body’s oxygen delivery during activity describes cardiorespiratory endurance. In practice, testing or training muscular endurance involves many repetitions or long holds, like push-ups to fatigue or planks held for an extended period.