Which statement best describes endurance as one of CrossFit’s ten physical skills?

• A. It is one of the ten physical skills, representing the ability to sustain effort over time.
• B. It is a method used for interval training.
• C. It is a measure of maximal strength in a single repetition.
• D. It is about agility in changing direction.

Answer: (A)

Endurance in CrossFit refers to the ability to sustain effort over time, including both the heart–lung capacity (cardiovascular/respiratory endurance) and the muscles’ capacity to keep working (muscular endurance or stamina). This makes the statement that endurance is one of the ten physical skills and represents the ability to sustain effort over time the best fit, because it captures both the place of endurance among the skills and what it actually describes in performance. The other options describe a training method (interval work), a measure of maximal single‑rep strength, or agility in changing direction—qualities that are different from endurance.