D. sets of rapid exercise which get progressively longer
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The interval workouts usually involve sets of rapid exercises which get progressively longer. Thus, the correct option is D.
An interval workout may be defined as a type of physical activity that generally involves a consistent period of high and low-intensity activities significantly.
An interval workout is a set of rapid exercises which occurs in systematic sequences of actions that increases its efficiency in response to a successively longer duration.
This sort of workout is performed in two periods, a high-intensity period involves the anaerobic exercises while a low-intensity period involves the recovery period.
Therefore, interval workouts usually involve sets of rapid exercises which get progressively longer. Thus, the correct option is D.
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