Question

Which part of physical fitness is measured by the amount work your muscles can do at any given time?

Answer 1

The correct answer is D - strength, the amount of work your muscles can do at any given time is D - your strength. If you would ask for how long they can sustain prolonged activation, you would be measuring and interested in endurance. 

Answer 2

The strength is the part of physical fitness which  is measured by the amount work your muscles can do at any given time. Correct answer: D

Muscle strength is measured during muscular contraction.The one-repetition maximum test (1RM) is the standard test used to measure muscle strength.