Answer :

Moderate intensity physical activity is characterized by walking at the speed of 3 to 4 mph.

Explanation:

The rate at which a physical activity is performed is determines the intensity of the physical activity. The intensity of physical activities is expressed using metabolic equivalents or METs. It is defined as the ratio of a persons’ working metabolic rate to the metabolic rate while at rest.

The MET for a moderate intensity physical activity is about 3-6 METs.  Brisk walking, dancing, gardening etc are examples of moderate intensity physical activity. High intensity physical activities have METs greater than 6.

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