3(a) .Exercise is often described as training and should include: A. Exertion of the lungs.
B. Exertion of the heart.
C. Exertion of the muscles
D. All of the above.
3(b). Muscular endurance is defined as:

3(a) The correct answer is D: All of the above.

3(b) Muscular endurance is the ability of a muscle or group of muscles to perform repetitive contractions against a force for an extended period of time. The greater your muscular endurance the higher number of repetitions you could complete.

A,b,c is the answer to the question

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