Final answer:
Intensity in physical activity is measured through heart rate monitoring and the RPE scale to ensure individuals are working at moderate or vigorous intensity levels.
Explanation:
Intensity in physical activity refers to the amount of work or effort exerted during an exercise session. It can be measured using methods such as heart rate monitoring and the rating of perceived exertion (RPE) scale. These tools help individuals determine if they are working at moderate or vigorous intensity, crucial for optimal fitness benefits.
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