Final answer:
The level of perceived exertion varies daily, making the Rating of Perceived Exertion (RPE) an effective measure for identifying aerobic intensity for pregnant soldiers.
Step-by-step explanation:
The Rating of Perceived Exertion (RPE) is an effective measure for identifying aerobic intensity for pregnant soldiers because the level of perceived exertion varies daily. Perceived exertion refers to an individual's subjective assessment of how hard they are working during physical activity. It takes into account factors such as fatigue, breathing difficulty, and muscle discomfort. Using RPE allows pregnant soldiers to adjust their exercise intensity based on their daily perceived exertion, which can fluctuate due to factors such as hormonal changes and fatigue.