Aerobic Exercise Training (Cardiorespiratory Endurance) Is Defined as Improvement in the Energy

Aerobic exercise training (cardiorespiratory endurance) is defined as improvement in the energy utilization of the muscle by means of an exercise program.Which of the following is true of this type of training?

A) It is dependent on sufficient intensity, time, and frequency of exercise.
B) A person with an initial high level of fitness has more potential to improve than one with a low level of fitness.
C) It produces significant crossover effects from one physical activity to another.
D) It requires at least 6 months of progressive training for evidence of improvement.